Credit Card Closure problem

I had a credit card from standard bank from 15/12/2014. In September year 2016 I requested a the amount I need to pay to close the account and it was given to me. I paid the whole amount and I phoned after paying to request a completion letter the response was that it will be emailed to me. Early in year 2017 I received massages requesting me to pay my credit card otherwise legal action will be taken against me . A couple of weeks later a guy from the legal department said I must make a payment arrangement. I went to the standard bank branch in prospecton where I received the credit card on their system it appeared that I am not owing and I was requested to call the card division. in the card division I was assured that the problem will be solved since it on their side. I repeated my visits for the same issue for 3 to 4 times . Even now it hasn't been resolved. I decided to write here because today my call was dropped at the after I explained my problem card division. My credit report shows that I am owing R143.00. After my visits in the bank to inquire on the 2nd and 26th of January 2018 I received this emails in each case:

Dear SKHUMBUZO MHLONGO,

We are still working on your service request ********** 593. Your service request is important to us and will be resolved at the earliest.

Thank you for your patience.

If you have any further questions about this service request, please call us on ***.

Regards, Standard Bank

For any queries please call us on ***.

If you are calling from outside South Africa, please call +27 (0)11 **********

Our lines are open from 8am to 9pm Monday to Friday and 8am to 4pm on Saturdays Alternatively please email ********** Footer Image