Terrible Account Handling by RCS/Game

I went to a Game Store in July to close off my account. I was put on the line to get a Settlement amount .I was asked asked whether I was looking to settle the account for closure or to keep it open since the amounts would be different. I requested a settlement amount for account closure which was close to R22000.I paid the amount off immediately and left the store thinking that my Account was closed. To my surprise I received calls that I have an outstanding amount which I need to pay. Since August ,I have been the one calling their Call Centre .I get different people every time I call(All asking different documentation) .I have now discovered that my credit score has been affected by this as it is now showing that i have arrears with RCS.