2) Second, when they call, go ahead and answer it, with this script: "This phone number is regsistered to the Federal Government Do Not Call Registry. Remove this number from your database and if you call it again, you and your company will be jointly and severally liable". It does not matter that they don't understand it -- 90% will be skeered enough to remove your number. Under DNCR they can call you once every 12 months (which was the sop to mistakes at the bill's origination), but once you have informed them, no. more calls. period.
3) Don't block the call - yet. If you can identify that the same hucksters are calling you, record it in your state if legal, and screenshot the call identification.
4) If it continues, lawsuit, lawsuit, lawsuit.
There are no teeth to the Do Not Call registry:
“Since 2015, the Federal Communications Commission has ordered violators of the Telephone Consumer Protection Act, a law governing telemarketing and robodialing, to pay $208.4 million. That sum includes so-called forfeiture orders in cases involving robocalling, Do Not Call Registry and telephone solicitation violations.
So far, the government has collected $6,790 of that amount, according to records obtained by The Wall Street Journal through a Freedom of Information Act request.”
Yep! As of 2019, the US Government had collected a grand total of less than $7,000 in fines!