Complaint and Query

I will like to complain and query my balance with Homechoice. December 2020 I have ordered cookware and was told that my 1st installment is end of February 2021 and on the 27th January i spoke to an agent and requested settlement amount of which i paid the same day. I constantly asked the consultant if the amount is correct and she said yes several times. The reason was in 2017 I paid off the account with Homechoice but later they came back and said I'm still owing. I need Homechoice to listen to recordings of the 27th January 2021 as i have fully paid the account as per the settlement given. I have received the statement stating I'm owing amount of R381.00 and this incident repeat itself were I settle the account but will still be charged interest on zero balance. Please fix this because I won't be paying that amount as i made sure that i get the settlement amount before paying off the amount. This needs to be sorted out with the different agents who gave me the same amount as settlement. This was the reason in the 1st place why I stopped placing order with them. If this is not rectified I'm afraid i have to take it up with NCA/NCR so that i can get a clarity of how i can be charged so much interest on zero balance. Please sort this mess out with your staff and give them refresher training on how to give correct settlement amount.