Fed up, still waiting for my refund

I am very disappointed in Supersonic. It was always a pleasure doing business with them until last year. My bank details changed and I called up to provide them with my new details for my monthly debit order. The guy I spoke with told me a payment link will need to be sent which I received and fill in my details. After I made the payment I called and was advised that the wrong persons link was sent to me and I will need to make another payment to the correct link. They could not transfer the amount paid to my fibre and was advised a refund will be done. Month end they double debited me for no reason at all. I called up and was advised that the previous refund is still in progress but will add this extra debit to the refund so now they owe me two montha which comes to R800. I have still not gotten my money back. It is almost a year now. I was sent an email in March this year from Khaole Kgomotso with a subject saying credit note request with a ticket reference SST289060. I called up a month ago as I have not received any feedback after many attempts of replying to the email. The guy advised me that the person my refund request has been assigned to no longer works there. He advised that he will get Khaole to have the case transfered to someone else. Up until today no feedback. I just want my money back gosh. It's rather easy for them to take people's money but can't pay them back.