Unable to close account

I settled my account and went to the store at Fourways Mall to close the account. I was notified that I should have gotten a settlement amount and that I short paid by R81.33 I paid in-store and was told to phone in two days to close the account. As promised I phoned to be told that I overpaid by R29 and the account can not be closed. I have to wait for the next statement and then request a New settlement amount and only then I will be able to close the account. Most frustrating as I am sure there will be extra costs and the process will start aal over again.