There's an easy way to stop this. After it happens call the police and say you're getting harassing calls. They'll file a police report. You then call the phone company and tell them you've been getting harassing calls, have a police report, and would like to put a trace on your line. They'll give you a phone number to call. Whenever you get a debt collector calling you, you dial the number. After 3 or 4 calls, the police will contact the debt collector and tell them to stop calling you. They will.