866-217-8494

They have an important document
LOL

Same message they have an important document in their office.  It is a scam it is a company trying to get your location and to find out when you are home.  I blocked call.

I received a call from this number and stated I have an important document in their office to call 844-720-1025. I blocked the call

My phone didn't even ring nor did a call show on my  caller id but I received a voice mail. It said
they have an important document & want me to call another number.

This number came up to 'call it' from the Zeus Virus Scam.  Major scumbag here.

When it is clearly a number belonging to a con man, how can the telco continue supporting it?

Same for me.  Blocking them

Received a call with an urgent message about an important document in their office and to call 844-720-1025  both numbers have now been blocked

The Federal Trade Commission (FTC), the nation's consumer protection agency, is warning consumers to be on the alert for scam artists posing as debt collectors. It may be hard to tell the difference between a legitimate debt collector and a fake one. Sometimes a fake collector may even have some of your personal information, like a bank account number. A caller may be a fake debt collector if he:

is seeking payment on a debt for a loan you do not recognize;
refuses to give you a mailing address or phone number;
asks you for personal financial or sensitive information; or
exerts high pressure to try to scare you into paying, such as threatening to have you arrested or to report you to a law enforcement agency.
If you think that a caller may be a fake debt collector:
Ask the caller for his name, company, street address, and telephone number. Tell the caller that you refuse to discuss any debt until you get a written "validation notice." The notice must include the amount of the debt, the name of the creditor you owe, and your rights under the federal Fair Debt Collection Practices Act.
If a caller refuses to give you all of this information, do not pay! Paying a fake debt collector will not always make them go away. They may make up another debt to try to get more money from you.

Stop speaking with the caller. If you have the caller's address, send a letter demanding that the caller stop contacting you, and keep a copy for your files. By law, real debt collectors must stop calling you if you ask them to in writing.
Do not give the caller personal financial or other sensitive information. Never give out or confirm personal financial or other sensitive information like your bank account, credit card, or Social Security number unless you know whom you're dealing with. Scam artists, like fake debt collectors, can use your information to commit identity theft – charging your existing credit cards, opening new credit card, checking, or savings accounts, writing fraudulent checks, or taking out loans in your name.
Contact your creditor. If the debt is legitimate – but you think the collector may not be – contact your creditor about the calls. Share the information you have about the suspicious calls and find out who, if anyone, the creditor has authorized to collect the debt.

Report the call. Contact the FTC and your state Attorney General's office with information about suspicious callers. Many states have their own debt collection laws in addition to the federal FDCPA. Your Attorney General's office can help you determine your rights under your state's law.

https://www.consumer.ftc.gov/articles/0258-fake-debt-collectors

Number didn't show up on missed calls, but had a voicemail saying something about "a document in their office". Wanted me to call them back at another number. Yeah, don't think so!

I got the exact same message. Phone didn't ring nor does it show in my missed calls. Just a voicemail saying they had an important document in their office and to call their number. No mention of my name, the name of their company/office, nada. Sorry, not buying it!

Phone blocked call and said telemarketing.