Closed account never updated on Credit Bureax

about 9mnonths back I went to Game President Street Jhb CBD and requested to close my RCS Game Account. I was given the settlement amount-which I paid in store and I was informed to write a letter of cancellation which I wrote and the store faxed it to the call centre for the account to be closed. I was informed by the lady who assisted me that the account is closed and I have nothing further to worry about. To my surprise I went to FNB on the 7th June to get credit, I was infirmed that I still owe RCS Game an amount of R900. I proceeded to Game eastgate to enquire and I was informed that the Admin Dept never updated my account with the Credit Bereaux and now everytime I want credit it will continue showing this on my credit report. Just because of some *********** individuals at Game Head Office I am stuck and unable to do anything for the next 21 days which will take for them to update it. I couldnot even get a letter that proves that I finished paying the account as it takes 48 working hours. This is totally unacceptable at any level. These people are messing up our credit reports and have a big impact on us getting credit. Game needs to wake up and sort these problems out ASAP