Because so many good folks telephones are being invaded with unwanted scam/spoof callers, several good folks and the Vonage VoIP Phone service, have setup a free call blocking service. On the Internet, Google  “free call blocking service” and see what is available, you will be glad you did. You can also get your own “Call Blocking Phone” and call-block all those unwanted callers. We laugh each time such calls ring our phone and are blocked and then exclaim, “Thank You.”