Complaint sub-issue: Didn't receive enough information to verify debt

Remex does not contact consumers to rectify debts prior to placing collections on credit reports. Remex reported a delinquent account in the form of a {$110.00} collection to the credit bureaus, however made no attempts whatsoever to contact me to notify or rectify the situation at any point before they reported this debt. When I called, they claim that they sent a communication in XX/XX/XXXX. I never received any communication and asked for a copy of the original communication, with date. Instead they sent a collection notice dated for XX/XX/XXXX. Their " client '' is a medical provider which is now permanently closed for approximately one year so I had I been aware I would have been able to contact the provider directly to fix the error. That is no longer possible. I received care on XX/XX/XXXX through a workers compensation claim. I have a discharge summary from their client dated for care on XX/XX/XXXX. The worker 's compensation insurance denied the claim because the provider did not supply the required information to the insurance, and had a date of service of XX/XX/XXXX. This date does not match the date of service on the discharge summary from the provider, their client. Instead of resubmitting the insurance claim with the correct information or sending me an invoice, the provider let this debt sit for five years until they permanently closed in XXXX, and then Remex obtained the debt as a collection, which was reported to my credit in XX/XX/XXXX and dropped my score significantly. The drop in score is what alerted me to an issue as I had no knowledge that any of this had occurred. When I called the worker 's compensation insurance company, they stated that the provider did not supply the necessary information, which is why the claim had been denied. I contacted Remex and explained that the date of service is incorrect and I have no balance due for XX/XX/XXXX. I asked repeatedly for an invoice which outlined services rendered on XX/XX/XXXX and amounts due, to which Remex said they could not provide an invoice but that it was customary for their client, who is now permanently closed, to send invoices. I have still not received an invoice for to substantiate that services or care were provided on XX/XX/XXXX and that anything is owed. The worker 's compensation insurance has also requested an invoice in an attempt to rectify this situation. Remex has been difficult to work with as they stand by their claim without providing an invoice, only repeatedly referring to the collection notice they sent in XX/XX/XXXX. I've never been late on a bill in my life. Now, because their " client '' made a mistake six years ago, I am being punished over {$110.00} that I don't actually owe. I don't understand how they can allege that money is owed for a date of service that does not match and without providing an invoice, bill, or discharge summary. Since there is a dispute that this is accurate information, a collection notice or a date provided to Remex from their client is not sufficient evidence that services took place on XX/XX/XXXX, since my records from their client indicate otherwise.