Standard Bank Incompetence to work with public's money

More than 2 months ago, i paid up my Blue Bean credit card with Standard Bank but they did not do their jobs!!!.I paid the full amount owing, then went to the SB branch in Midrand Boulders to get a SETTLEMENT AMOUNT, to totally close the account.They gave me a 5 day window to pay this settlement amount, witch i paid the same day.Three days later i called the number they gave me, only to find out nothing has been done and the account is still active.Now 2 moths later, i still battle to close this account, but BEE fails to do their jobs!!

I want a bank letter, stating the account was closed by myself and fully paid up, or i will involve my lawyer to do their jobs at the banks cost.