I hate to tell you Annoyed but the do DNC list does work. Do you realize how many more calls you would get if the telemarketers who follow the law called you? Second,what you and a lot of others don't seem to understand is the list has stopped all the legal telemarketers from calling so now the only calls you get are from scammers.
Let your phone do the work. Don't call back these idiots. If it is someone worth your time they will leave a message. Spend your time on much more fun or profitable things.