This is real simple. Just tape record the calls. Let them rant and rave, use profanity, call you names, etc. Don't retaliate as you are 'playing' to the tape. After they have called four our five times, google a local fair debt collection lawyer, send him the tapes. You will get $ 1,000.00 in damages for each call and your lawyer, your new best friend, will get a boatload of attorneys fee.
Recording the calls is actually a way to make good money.
Nancy, I too am receiving calls from this company and am doing the best I can with all of them. How do you know if something is a zombie debt and/or past the statue of limitations?