A Year later no Refund

After they had handed me over, I paid my account in full. But they still claimed that I owed them money 3 Months later. I paid the amounts the claimed that I owed them, as they had threatened to blacklist me. As I was going through my statement, I realized that I had made an over payment of R1450, this was in April 2020. Since then I have been trying to get them to refund me my money they just take me through hoops. I have spoken to several people at the TFG claiming to be handling my claim, I haven't received any feedback. Charlene Muller and Tiaan Van Schalkwyk keep saying that they are processing. BUT still not refunded