If you actually call the number, it gives you an option to put your number on a do-not-call list. In fact, it's the only thing you can do when you call the number, soooo.... why don't you try that?
Rec call from this number on May 26 12:43 PM eastern time. I was at work lunch-break when called. I acted interested and asked the sales person to hold on and I will go get my wife. left the phone alone for 10min, came back and told sales person that I am still interested and please hold. Every 15min or so when I could check phone I keep him waiting for over an hour. Finally he gave up, and he hung up. So if they call me they can expect not just a wasted 2 min call, but it could be well over a hour that they are not bothering someone else. Not like it, do not call.