Being on the National DNC registry helps somewhat, but not with all callers. there are callers exempt from the law, such as NON-PROFITS looking for a donation, and political fund-raising groups. Go figure.
I also received a call from CA Police Youth Charities. I also got a hang up from them. What most of you don't realize is that despite the fact we are all on the DNC list, Federal law allows charities, polling organizations and political cause organizations to call you. They are exempt from DNC. That is the only hole in the law. Also businesses with which you have a relationship as a customer or former customer within the last 18 months are allowed to call. The only hope you have is to individually contact each and notify them that you want to be on THEIR DO NOT Call list. They are required to comply in a reasonable period of time. If they contact you after that you have the right to seek damages. But even a telemarketer who calls you by mistake gets one free ride in most cases. You must notify them that you are the DNC list and then if you get a second call you can nail them big time. And trust me they know it.