XXXX XXXX messed up their accounting when I closed my account with them and they have told me on 3 separate occasions this year that I do not owe the debt. Unfortunately XXXX assigned the debt to a collection agency who will not stop threatening me despite multiple calls from me explaining the situation. Each time the collection agency says they will contact XXXX to confirm the status but XXXX has no record of them doing so. The collection agency is Credit Protection Association L.P., XXXX XXXX XXXX, XXXX TX XXXX. The amount I am being told to pay is {$40.00}. Their reference number for the collection is XXXX. The phone number for the collection agency is XXXX. Constellation has assigned me a reference number for this issue - that ref number is XXXX. I feel like I am being extorted for this sum and wish to file a complaint against Credit Protection Association L.P .