This is now a huge issue with almost everyone. Being on the "do not call" list means nothing. Landlines are already going the way of the dinosaurs and daily telemarketing calls with hasten the death of the home phone. Cell phones are also victims to this crap, but why get pestered from two fronts when you can cancel one easy enough. Legislation to require caller ID is a joke. The phone still rings with nothing but recordings for mortgages and credit card crap.
Instead of helping, Verizon wants to charge me a bundle of money for blocking the repeatedly same numbers. I'm paying $600 a year to get harassed and they want more of my money to make the harassment stop.