Service charge for settlled and closed Garage Card

I requested a settlement amount for the Garage card account that I operated with Standard Bank. I settled the amount and considered the issue settled as I had informed Standard Bank during the recorded conversation that I wanted to close the account. I subsequently received a statement from Standard Bank which showed that it owed me twenty three rand and thirty three cents (R23.33). I further noticed that the information relating to the closure of the account had not been sent through to the credit bureaus as it still appeared on my profile as one of the accounts that I have. Today, I received an electronic statement from Standard bank which shows that an amount of R28 being service fee has been charged to the account thus I now owe the bank four rand and thirty three cents (R4.33) . I settled the account in the first place as I no longer require the product which Standard Bank is now forcing down on me. I request Standard Bank to honour me as as customer and act on my request to have this account closed.