800-123-9877

This number keeps calling my cell phone, will not leave a voicemail. If I pick up, say hello, they hang up. These calls are coming in up to 10 times daily.

What options does one have to defend themselves against intrusive callers?

• The Do Not Call list (Federal or State)
Works, but is effective against ONLY "legitimate" telemarketers.  Political callers, surveys and some other callers are exempt.  Scammers ignore the DNC list.

• NoMoRobo
A system offered by some telephone providers, to help automatically block robocalls.  Google "nomorobo" to see if it works with your phone provider.

• Shouting, screaming, swearing at the caller
Nope.  Does not stop calls.  May make you hoarse, and will disturb nearby people.

• Call blocker app, device or service
Could be a good choice (even though the scammers can use fake phone numbers), and some apps are free!
Google "call blocker" for more information
Your phone provider may also offer blocking services.  Check their web page for information.

If you cannot use any of the above defenses, then:
• Do not answer calls from unknown numbers ... let them go to voicemail or answering service
• Do NOT return calls from unknown numbers!  All that does is verify your phone number!  And, in some cases, those return calls may cost $20 or more to complete.  http://www.consumer.ftc.gov/blog/one-ring-cel ... ing-your-wallet
• If you have a "dumb" cell phone, assign the scammer's number to a group named "scammers" (or similar).  Then, assign a silent ringtone to that group.

Calling 6 to 7 times a day and sometimes with a few minutes of each call. Have not answered. No message. Getting pissed.

I get up to 10 calls a day from this number

I am getting at least 10 a day.  I am PISSED!