Lingering credit history despite paid up account

My account has been closed for a number of years. However I was never sent a paid up letter and the Credit Bureau was never notified of the closure of this account either. This means that my credit report reflects that I have an Edgars account and thay I have more credit available to me than what is actually available impacting my credit score.

I have contacted Edgars/RCS but they would not help me as they could not find any reference to my account using my ID number. They would also not supply me with the details of the ombudsman for me to escalate to. They just kept referring me to the company that handles their bad debt despite tellling them that my account was never overdue or refered to debt collectors.

And the credit bureau can't update my credit report without a paid up letter, which I cant get.

This is a terrible experience and a sad example of how Edgars does not care about their customers' (past or present) financial future.