Frasers Menlyn, why don't you give my money back?

In August 2023 I made a lay-by for a bag at Frasers Menlyn. After a few weeks I went back to pay the balance (R2 000). When I was home looking at the receipt, I realised they had charged me R1 000 extra. Went back the very next day. The manager apologised for the mishap and started the process of refunding me. I have gone there three times to enquire. The people who are supposed to respond to the manager's phone calls and emails have no intention of refunding me my money. It was my first time going into that shop, and it was a nasty experience. I want my money back. I don't have to beg. This is really bad service. Look for someone else to rob.