These jerks call me every so often. I now tell them that I won't do business with them because they lack ethics. They say HUH? and then I explain that I'm on the Do Not Call list and either they didn't check or they don't care. In either case they lack ethics. Usually there's a silence at the other end while they try to digest what I said at which point I just hang up and laugh my ass off. This work well on other phone trolls too.