Asset Acceptance, LLC Trying to collect on credit card that isn't mine... Warren Michigan

Asset Acceptance has been sending me letters trying to collect on a credit card that isn't mine. When I did call them and tell them it is not my debt they responded by telling me to file an identity theft report and send them a copy. How and where do you file this report if you don't know where this theft occurred? My only responsibility was to notify them that it was not my debt. They continue to send letters. They cannot call as they do not have the number. Why doesn't anybody like the government stop them. I noticed that they keep checking my credit report. They have no business doing that. I owe them nothing on that card. They will not stop with the mailings. How do I stop them?

Lilbluesy
Waterloo, South Carolina
U.S.A.