Read the two informative posts on the first page and this page. Then do this:
You need to send them a certified, return receipt debt validation, cease and desist calling, or "not me" letter. You also need to report them to the proper agencies to which I have provided links to. Then you need to go out and get a consumer lawyer to sue them on a contingency basis (no money out of your pocket) and let them pay you for the harassment. If everyone did these three things, these crooks would be bankrupt and we would all be the richer for it.