I have tried to block them I just got a letter from the phone company telling me the calls I get are not illegal and they can’t do anything to stop them.
I have Time Warner digital phone, and you can block calls at your account site online. I also have Verizon cell phone service. I have a basic phone, no Smart phone, but can still block up to five phone numbers for a 90 day period at my Verizon account site online. I believe if you have a more intricate type of phone, you can block more calls.