They call many times every day. I never answer and they never leave a message. I'm on the do not call list, that's a joke. How do I block these nonsense call?

Received a call today, Caller ID's as "Willcox, AZ". Caller identified himself as "Freddie" and wanted to know how the medications were working out. No idea who or what this is and suspect it's targeting seniors as he asked for my 82 year old mother. Lookup shows Bobby J Nix, but also says he's 73 and the person on the phone didn't sound 73; sounded much younger. This may be a phishing call and I've a good mind to alert the Willcox, AZ police.