Can You Block a Spoofed Number?

Sadly, it seems call blockers work only on the number presented as the caller ID number.  It also seems that it's getting much easier and more automatic to spoof a caller ID number lately, so determined callers (like yours) can hit from several different angles.  In your situation, it sounds like you have a perfect case to contact law enforcement - since you already know who's calling anyway, there should be no need to set up a trace on your phone (unless they need to do so for evidence.)

Cincinnati Bell is even more ridiculous:  "A Call Block lets you program up to *6* telephone numbers that you want to block..."  Six whole numbers!  I ate that up on day one of call blocking.

Check around.  There are devices that allow up to twelve hundred numbers to be blocked.

I had the same problem with my primary phone carrier, Time Warner Cable, now Spectrum.  Their limit is 30 and I reached that in no time.  Since I've had my phone number since 1982 and don't want to give it up, but also have a separate cell phone number I don't want to give up I set up the CALL FORWARDING feature from my primary phone to my cell.  My cell is an Iphone which seems to have an unlimited number of calls that can be blocked.  I have blocked hundreds so far with no end in sight.  As far as I can tell it is limitless.  So instead of using your phone service to try to block calls, get an Iphone and block them that way.  When a call comes in you want to block hit the i button to show the information, then scroll down and it will say "block this caller".  Tap that and voila!  Blocked!  To see how many you've blocked go to SETTINGS, then PHONE, then PRIVACY....you will see all the numbers you've blocked.

So, you recommend getting a $600 or more phone to do what a $50 call blocker will do?  Or what a free call blocking app on any smart phone would do?

Some people cannot justify using an iPhone. Can blind people use an iPhone? Can the elderly or those on various medications, who have hand tremors, even use an iPhone?

You are only blocking the calls on your iPhone, not your landline.
If your cell phone quits working, is lost, or stolen, you have no call-blocking, as you would have to turn off call forwarding to be able to receive calls on your landline until you got the iPhone repaired or replaced.
Having the landline phone forward calls to the iPhone is a great idea for getting calls when not at home to answer the phone. But only for a single person. When there are others in the home this solution is sub-optimal.

There's a free way to combat most of these annoying calls on many low-cost feature-phones and smartphones.
No $600 phone needed.
No app or other service involved.

On all my low cost ($50 and under TracFone) Android LG smartphones, I have the option of denying ALL incoming calls that are not already in my Contacts List.

That setting forces ALL calls from unknown numbers to go straight to voicemail.
Legitimate callers, friends and relatives with new phone numbers, and law enforcement personnel WILL leave a voicemail message.
99% of scammers, spammers, and con artists do not leave voicemail messages.

The calls then appear in my Call log, and If I want, I can add them to my Blocked group. Once in a while I want to know if a Blocked call is trying again. I made the ringtone for my Blocked group a recording of a couple seconds of silence, so the number displays on my phone, but makes absolutely no sound.

HOW DO I DO THIS?
On my LG41C TracFone running Android 4.2 (Kit-Kat) It is under Settings, Call, Call Restrictions, Incoming Calls, then select Contacts Only. Other flavors of Android on different devices will likely have similar settings, but you may have to poke around a bit to find them. Ask the nearest 12-year-old for help.

WHAT IF I HAVE A NEW PHONE? I won't get ANY incoming calls!
If you're transferring your account from another phone, you can likely also transfer your all or parts of your Contact list, so you don't have to re-enter numbers from your old device. I've done that 4 times, first from Feature phone to newer Feature phone, then to smartphone, to newer smartphone, to newest smartphone.

Awesome, thanks for the tip!

TLDR alert ; )

In order to answer your question, let's talk about caller ID for a moment.  There are many variations in the details, but I'll offer a simplified summary based on a scenario of bad actor VOIP callers contacting POTS (plain old telephone service) line holder victims.  Even those who have home VOIP service are typically using POTS telephones with an adapter that converts the VOIP connection into POTS style service.  Those of us who have real VOIP phones at home are just indulging our excessive geekiness ; ) .

Caller ID is an old technology.  It transmits a simple text string using a very old analog modem standard.  It populates the text string from two sources.  The calling number (CNUM) field is in many cases under the control of the caller (PBX/VOIP).  The caller name (CNAM) field is derived by looking up the CNUM value in a database.  Number holders can submit the CNAM value to be associated with their number(s) to the CNAM database(s), and phone system administrators may populate the CNUM field pretty much any way they like.

Call blockers rely on the CNUM (calling number) field contained in the CID string.  There is no magic inclusion of the "real" number.  The ability to control the CNUM (the key to spoofing) is actually an important and much needed feature of the phone system.  Without it, hospitals, hotels, and others would have no way to manage incoming call traffic, or to provide customers with a consistent number to call them on.  Unfortunately, the phone system was developed in an era when those who had access to these features were "trusted persons" who (at least in theory) could be relied on to use them appropriately,  As VOIP, the Internet, and small computer technology has progressed, these "trusted persons" features have been pushed out to the entire population, and some folks are abusing them.  There are legal sanctions against this sort of abuse.  It is now illegal to spoof a number to deceive with expectation of financial gain.  It is possible to document such events, but it generally requires speaking to the caller and getting them to reveal some sort of identifying information.  This may work in the case of a scofflaw collection agency, but is much less likely to bear fruit against outright scammers.

There is a way to capture the "real" number which does not rely on caller id.  It is called ANI, but it is not nearly as easy to obtain access to as caller ID.  If you have an inbound toll free number, you may have access to ANI, but some retail providers of toll free numbers don't pass this data, ironically, to prevent abuse.  In the strange but true unintended consequences categories, restrictions imposed at the behest of battered women's shelters have had a small role in aiding the cause of those seeking to hide their illicit telephone activities.  I'm not voicing an opinion about this particular issue, but it does illuminate the fact that the "simple solutions" often proposed to prevent tele-scamming, such as technical prevention of all spoofing, can create new problems, many of them more serious than the problem they sought to solve.

So, long winded answer, but caller ID based call blockers cannot block the "real" number behind the spoofed number.  In order to do that you would need ANI.  And while spoofing to deceive for financial gain is illegal, it is sometimes hard for consumers to pursue, unless they happen to have an ANI capable toll free line for their home phone, or a lawsuit during which they can depose the phone system's admin.

Now you know some of the reasons behind the answer.

-LS-

I think I know what you are asking, if all calls from a certain business can be block and as far as I know, no it can not.  At this time I can see a few work around for you.

(Please note the following suggestions are based upon the phone in question being a cell phone)

1)  Get the Companies address and write a formal letter stating the situation and for them to cease calling you send it certified mail.  Make sure to keep a copy for your records.  If this is a legit company they must comply.  If not you can send a formal complaint to the better business bureau (In a perfect world this would work.)

2)  I do not know how often you use your phone  (i.e my mom only uses her's to talk to us kids) activate call reject except for numbers in contacts.  You can look up the instructions in google.

3)  Add each number to phone auto reject list,  which in itself is a problem if you phone does not have one, or is limited to so many slots.

4)  Request a number change.

5)  Perhaps call your provider and talk to their customer service to see if they can help?

I hope this helps

Many years ago a debt collector kept calling my number and leaving messages on my answering machine if I didn't pick up.  They were looking for two people who were unknown to me and I'd had that number for nearly 10 years by then.  The police were no help.  But the debt collector left an 800 number to call them back.  So I set up the fax machine on my computer to fax them a message saying that XXX (the guy they were after) was not at this number.  I then sent them the fax and set my fax machine to redial up to 50 times if the fax didn't go through.  Each time that they called me again, I sent them another fax but doubled the number of redials.  My machine had a feature where it would only try during certain times of the day.  So I set it to start trying one hour before they opened and to stop one hour after they closed (7a-11p as I recall).  I could hear them pick up and say hello, only to get the fax screech.  They'd hang up after a bit and my machine would try again.  The cycle time was about one minute.  They tried using *69 but the fax machine was on line so it would activate and give them another screech.  This continued until we were at 800 redials, and 13+ hours of them answering the phone, before they stopped.

Just wondering what does your post have to do with the subject of this thread?  There was also a much easier and simpler way of solving your problem as well, too bad you didn't take the time to learn what it was.