I had a coworker that went after autodialers, recorded calls, and anyone not a friend, with a vengeance. Following the Telephone Consumer Protection Act (TCPA) he would demand his number be placed on their do not call list and for them to send him a copy of their do not call policy. If they did not comply or ever called him again, he would take them to court. He was often taking time off from work when someone wouldn't settle out of court. So off to court he'd go, again and again and again.