The point is that you are given a choice but now someone is not allowing Republicans to campaign by telling the caller that it’s a scam therefore don’t answer it.
It means someone is “spoofing” the legitimate phone nuber, like using VOIP (voice-over-internet-protocol) calling via the Internet - in which the caller can make the number it looks like they are calling from mimic any number they want it to look like. The method uses a giant technical hole in the VOIP protocol in which the spoofing is not checked as the number leaves the Internet and gets into the “telephone” transmission/data lines, and then “telephone” systems just assumes it is the real number being called from.
If I was your “benevolent dictator” I would shut down all VOIP transmissions in the U.S. until the Internet gurus can get rid of the “true number” identification problem.