These collection companies are a cult and industry until themselves. I get calls on my cell phone from the same number 3 times a day, and I am NOT the debtor, the message they leave is for some guy whose name I cannot pronounce.
Once the debt is written off. The original debtor is out of the picture. These companies threaten, but can do nothing. They can not sue, get a judgment, lean on real property or garnish wages. They just try to bully.