You should be able to set your cell phone ..... where you can reject a call anytime you don't recognize the # ... you will not be charged for the call if you don't answer. Your provider should be able to show you how.
Unwanted, illegal, unsolicited robo-call. I filed a formal online complaint with the FCC. Not that they can do anything about it - they are overwhelmed with complaints, and a lot of these telemarketing BOZOS are using computer software to call millions of numbers a day.
I'm also going to call my cell phone provider and complain that they want extra money to block unwanted calls.