Never have I EVER dealt with such incompetence!!! ...

Never have I EVER dealt with such incompetence!!! I settled and closed my Standard Bank accounts in November 2015 and even received my settlement letters. Now, I get bombarded by MBD for outstanding amounts on my Standard bank accounts. And when I call the call centre, they tell me, "oh, yes, we see the letters here but we need a proof of payment" (WHICH I HAVE SENT FOUR TIMES ALREADY)!!! How do you still operate as a business???