Jun 5, 2013
Report the caller to the FTC, the FBI and also your state's Attorney General. You may also want to put fraud alerts on any new bank accounts you have and also with the three credit agencies (Experian, Equifax and TransUnion). If you can't block his calls, tell him that all calls he makes to you are being recorded and forwarded to the FBI.
If you do have a debt, legitimate debt collectors do not threaten or harass, and they send you a debt validation letter proving you owe the debt and that they can claim and collect said debt. Read about the FCPA and learn your rights as a consumer.