The Do Not Call list has done nothing for me either. I get calls everyday on my home and cell number. I usually let it ring but sometimes I answer and insult them. Just depends on my mood.
The calls come on a different number every time so if it is a local number I usually answer. Some times it is a legitimate call, sometimes not.
Most of my calls go to my cell phone which is stupid. There was one week I forgot to set the messaging app and actually it was better because they cant leave a message NOR text as they are all landlines..