Standard bank refusing to update my credit profile with bureas

I had taken out a personal loan with standard bank to the value of R70k. I have never defaulted on any payment(s). I have since settled the account in full. My Credif profile at Transunion and other Credit Bureas still reflects this loan as owing which is not accurate and thus denting my credit score putting me in a disadvantage as a consumer of products using credit facilities. I have engaged the bank only to be sent from pillar to post by the call Centre. I requested a settlement letter to which I was refused despite my settling the account 3 months ago. When I advised them of my predicament regarding my credit score I was advised they acknowledge the fact that the account was fully paid up there was an issue with their system which prohibited them from closing the account and thus I had encurred costs of R91,50. My credit report reflects that I owe the bank R2431 which is not the case at all. I was further advised that they will update the information with all credit bureas 3 months from now which I find unfair as a consumer as I settled this account 3 months ago thus it will mean it’ll take them 6 months to update my record with the bureas? I’m rather disappointed by standard bank. I’m a Prestige Account Holder but I find the service purely disgusting, hello peter please assist urgently.