Gross mistreatment by Donna

I settled my account in December 2019, which had a balance of R13 000. I went inside the Pavillion Westville shop to get the exct balance owing and the correct eft banking details to use. I made 2 transactions ( R5 000+ and R8 000 ). The balance was R0.00. Two months later I kept receiving statements of R5 to R20. I queried telephonically. Each time I was told that they wil check and come back to me. This never happened. One time I went back to the shop where I paid. They still put me through the same number. When I asked for the details of the person I was talking to, she said she was Thembi and rudely refused to give her surname. She also promised to retrun my call after checking. I also made several telephonic enquiries , got the same empty promises where they take my details and account number but never return my calls. I now have received a letter showing a balance of R36. 17 with threats to ruin my credit score, almost insulting with the words "you are in breach of your contract" I settled the contract amount, which was more than R17 000 and have been harrassed by this unprofessional institution for the R36.17 that they made up. The ladies on their call center and collections departments leave much to be desired for their rudeness.