The trick to making these calls stop is to convince them that they are wasting their time and resources to call you. This is very difficult to do since the resources that they waste are small and the reward of scamming you out of your money is so great. I have found a way however. You must proceed until you get to a live person. Then tell that person in the most forceful, obscene fashion that you can that they should go engage in intercourse with themselves and then call you back to report the results. This conveys the idea that subsequent calls will not be productive and they remove your number from the list more certainly than any other way that I have found. It also is very good for relieving the frustration that they have caused you to feel.
Perversely, this is also what is best for them since it prevents them from wasting time trying to wheedle you into changing your mind.
Try it, you'll like it.
Feel free to cut and paste this advice on similar sites!
Unknown 206 number calls too often. Not one I do business with - so ignored the call - again. I thought my do not call registration was valid for 5 years ! Apparently not...
The do not call list is a joke. This and other "surveys" call me Saturdays, Sundays, Week days at any time morning, evening, night sometimes 10 or more calls a each day. I think I will change my land line to Google and mark any call I do not like as Spam! I am so ready for Google. FREDOOM! :-)