Homechoice get your house in order

On Aug 12 2022 I contacted Homechoice for a full settlement which was paid on that day. I requested a paid up letter which the consultant advised will only be available at the end of August. I received a new statement online on 5 September for an amount owing of R81.72. On querying this amount agent Samantha (who for security reasons cannot put me through to a supervisor nor give me a surname) very haughtily informs me that because I paid via an external party (a bank is also an external party for Homechoice) I incurred R charges. The rest of the R81.72 is interest. Interest on what may I ask, a fully paid up account?? This is ****************. I suggest a manager contact me to discuss this matter before I take further correcting measures. I will not accept this additional charges and will refuse any debits on my account