Refusal to Close Credit Account

I requested my game card credit facility to be closed at a Game branch in Mimosa Bloemfontein on the 3/09/2015, I was told by an agent from RCS on the phone that I should pay an amount of R235.44 which was valid for just that day which I did....I was then asked to write a letter requesting the account to be closed, and this letter with my ID was faxed to ***.... Today however when I make an enquiry with RCS to follow up on the account being closed I am told the process to close the account takes up to 30 days, I think this a ridiculous way of trying to make money from me as they charge you interest even if you don't use the account.... I have experienced it before. I am thoroughly disappointed, when I opened the account everything was finalised in one day but to close it takes eons????