Closed account

I have closed my accounts with African bank on the 7 March 2017, I sent proof of payment and all. Now recently i am seeing that they have opened a credit card with a limit of R9000.00 and i have an owing amount of R585. I called them no one can explain how that account is active and where the balance comes from. Incompetant people i tell you, I have requested they close the account and this so called balance to be reversed but none of that seems to be done Can a competant person call me and send me roof that this has been cleared and I dont want anything to do with this so called ****ed bank