YES... I.e.: if you are on the national DNC registry, and an automated telemarketer keeps calling you, the best thing to do is have the state att'y general mail them a letter, and eventually this will actually scare them enough to stop calling.
Looks like we are in this for the long haul. This article (which is long) is about the history of "caller ID Spoofing". It appears the authorities are aware of this practice, but it seems to be spreading and maybe out of their legal reach.
This "extended warranties" business has been calling us for two months...at home, on our cell phones, and at the office. They have considerable knowledge of the type of our vehicle, the extended warranty that my husband has purchased, etc., which leads me to believe that General Motors has given them this information. Their computer-generated calls will not stop. I am unsuccessful at trying to call them at this number.