Same here.  The man says he sent me documentation about an old debt that his company is the collector for.  He started calling two weeks ago and said I should have received the documentation by now.  I told him I had no documentation and would not talk to him without correspondence by mail demonstrating his claim to the debt. He said he would send it.  Nothing.  Today he calls again.  I don't know how to get him to stop but I plan to call the Attorney General's office.