I got a call just a little bit ago. If you ask them what number they are calling from they will give you your home phone number. If you ask to be removed from their list they will tell you the calls are computer generated and there is no way of the calls stopping. We called the Attorney General's office and they have been working on getting these guys for a long time. I just block the numbers now.
This is also what I do if I feel like sparing the time. Waste their time since they've wasted mine. Filing a complaint at the DNC website seems to be useless.