I received a letter from The Northland Group attempting to settle a debt in collection. I responded to the letter requesting proof they were authorized to collect alleged debt via certified letter. They immediately responded saying they returned the collection to XXXX but XXXX is not the original creditor but a collection agency. My credit reports indicate the account in question has been sold multiple times and is being reported to all XXXX credit reporting agencies by XXXX, XXXX and XXXX. All XXXX report inconsistent dates of charge off/collection and all XXXX report inconsistent amounts of the actual debt owed. The debt is being reported on all XXXX credit reports as an active collection even though I have disputed this through the CRA's. Despite my disputes have never received anything materially relevant from any of these companies proving my obligation to this debt. To date I have not had any response from XXXX. I sent a certified letter to XXXX requesting proof of, verification of their authority to collect, and my options to resolve this debt so I may resolve this issue, I requested a response within five days as per law. XXXX signed for the certified letter over one week ago but has had no contact with me and have not given me proof of the debt, my responsibility or options in resolving this matter. I request all communication be done via US Mail and in writing on a company letterhead.