Refund back my overpayment and provide excellent customer service

Please be advised Finchoice is a ***** of company with bad customer service. I settled my loan in June 2022 with then. I then provide my settlement letter which is proof of payment to indicate that I settled in time. Then yesterday being the 20th July 2022 they double debit an amount of R1608 and R117 for what I don't know. I then communicate with them via emails and they inconvenience me that unfortunately they won't refund me and that my account will still remain active. What the hell do these people even bother checking the documentation they request from clients after settling. Finchoice please refund back my money and stop with stories. You are inconveniening me during these difficult times we are experiencing in South Africa.