Edcon group unable to produce a paidup letter

Good Day

Herewith I wish to submit a formal complaint against the Edcon Group which was brought by The RCS group. I previously had an account which I settled in 2015. I have requested a paidup or prescription letter as it's a requirement to submit to fix my credit record.

The creditor is unavailable to trace my account. They have referred me to the nimble group and also to consumer group who is also unable to assist me. I called the customer services today. I spoke to a gentleman, I requested to speak to a manager because once again. He cannot trace my account. He gave me the nr for TransUnion, who referred me to the creditor for a paidup letter. This is a waste of my time and resources. I just need this letter from the creditor.

Please advise on further steps and finalise this matter which is a very small urgent request.

Kind regards