Standard Bank treated me unfairly

I had loans with Standard Bank and settled all of them, as I was busy paying them up I asked Standard Bank if is the other loan left they said no, o went to my credit profile I checked there was nothing, so I have a revolving loans with them that was closed in 2021, so now I wanted to apply for another credit and it happened that I app**** for debt review but I cancelled with them before they assisted me , because I realised I can do this alone, so now I wanted them to remove me from their system they asked for paid up letters for the loans I have I went to Standard Bank they gave me other letters but refused to give me for that revolving loan and they said the account is closed but they don’t see my payment on their system, I must give them the proof of payment which I don’t have because this loans was closed in 2021 and I have changed bank accounts, so they investigated and found out that the loan was not paid up so they decided to reopen it and handed it over to attorneys, I asked them if the loan was not paid up why they closed it because I could’ve paid it long ago now they my life is delayed because of them they said maybe system issues that’s not my fault