ATG Credit, LLC Debt Collection Complaint

ATG Credit, LLC Debt collection department,

Non-federal student loan Cont'd attempts collect debt not owed Debt is not mine Michigan

I recieaved a letter from a company called ATG Credit , LLC stating I owed money to - in - 2016. I called - on - -, 2016 and told them I know nothing about this charge and wanted to dispute it. The person said OK they would put a dispute request in and send me documentation from -. In - of 2016 my credit report was now being reported as a collection agency for something that I still had no idea what it was for and had nothing from - showing what is was for. On - -, 2016 I was sent a ledger as proof from - which was now over 60 days later of me entering a dispute. What - sent me still shows nothing of how this debt is mine. I called them back and told them this and they said they will reach out to - for more info. This should not be reported to my credit if they ca n't supply proof within 30 days or send proof of how it belongs to me.