> Next time you get a call, waste their time a little pretending to be slow and then do something to make them angry such as explain that you've been wasting their time and don't approve of their business methods. They'll put you on some uber-mark list as retaliation, and you'll get a couple of dozen calls over the next few days.

Iunno, I do this every time and they usually hang up on me quickly.

If they uber-marked me, they'll just waste even more time. But alas it hasn't happened.