I have Verizon, forget Verizon's block numbers. Check out PrivacyStar. I have had it for 4 years and it is the best. Service is free unless you want the look up feature, then it is $19.95 a year no contacts. No limits to block numbers Phne never rings from known telemarketers.
This number calls repeatedly and I do not answer because it is not a familiar number to me. Verizon will allow you to block up to 5 calls for free for a certain amount of time. I blocked this number this morning.