Credit card still active after settling the account

Hello. I am once again disappointed in Standard banks failure to update information. I have settled a credit card months ago and even sent them my receipt of settlement. The bank had even told me that my credit card is inactive due to it not being used in years and assured me that my account is settled. They even gave me a letter saying it has been paid up. However I see this is not the case on my recent credit report. It is showing that I have a balance over R1000 in arrears and this has resulted in a decline in my credit score. This is utter ****!!! How many times have I been through this with them! I am 25 year old with a bad credit score! I am sorry but this failure to act out a task that keeps reiterating itself makes me believe that this is just a matter of competence on their side. I am no longer in the country. So please contact me on **********