What to do about intrusive phone calls?

Yes – I am on the “Do Not Call” list and am not getting calls from telemarketers but….someone must have sold my number. I am getting 6 or 7 calls a day from charities and political organizations. Most of them are robocalls and the rest are inarticulate idiots. Is there any way to make it stop in addition to being rude and demanding to be taken off the list when i get a person? It is really annoying. And please don’t tell me to give up my landline because I want to hold on to it for now.