They don't want to give paid up letter

I called their call centre on the 29 November 2017, spoke to Anna Mokgolo at collections department, asking for a settlement letter, because I wanted to settle my account on that day, she spoke to her manager, they gave me a 25% discount. I was owing R11 446, then after the 25% discount they said I must pay R8599.62, it was valid till the 06 December 2017. I paid on the 30 November 2017. After 7 days I called them asking for a paid up letter, they said they will send my account to another department for closure, I must call again, the closure takes 5 days. After I received this SMS

"Your AFRICAN BANK CREDIT CARD statement on 07Dec: Ref ********** 2648: Bal:R2867 Instal:R585 ARREARS:R2867.Try www.africanbank.co.za or *120*225# for more" I called them, they promised to sort out the account. After few days I received another sms, "Hi MS SP SHIKWAMBANA. We are sorry we cannot complete your request with your account closure because of Account Has not Been paid in full for Acc Ref ********** 2648. Here is your reference number - ********** . If you have any questions feel free to call us on ***or visit your nearest branch. African Bank Auth. FSP Reg NCRCP7638 RDC91017/16"

I called them again, they made the very old same promise that they going to sort my account blah blah, I must wait for 7days again, I received another sms, " Hi MS SP SHIKWAMBANA. We are working on your account closure and will give you an update by 15/12/2017. Here is your reference number - ********** . If you have any questions feel free to call us on ***or visit your nearest branch. African Bank Auth. FSP Reg NCRCP7638 RDC91017/16,,

I called again on the 15 December 2017,only to find out that the discount they claimed to have given me was not authorised. I spoke to a guy called mbongeni, he put me onhold saying he was talking to one of the managers, they are going to sort this problem, they will call me back before the end of business day. They never called. I don't understand why they are doing this, their customer service is worse, they don't do their jobs, managers are ***********. I am very disappointed in their service.

Now I'm receiving calls from some company called MCS, claiming to be working on behalf of African bank. They said I owe African bank R11650.00, I must pay them before end of the month, or else they are going to send me summons. They even sent me this sms, "Att. SHIKWAMBAN. REF: ********** ********** . Kindly contact MCS. TEL: ********** 500 FAX: ********** 350 EMAIL: **********

I became even more confused and frustrated. AFRICAN BANK, I NEED THAT PAID UP LETTER, I NEED TO SUBMIT IT TO ITC SO THAT THEY CAN UPDATE MY CREDIT RECORD.