Pathetic Customer Service (TCF) - Samsung Shop Mall of Africa

I went and ordered the back glass cover for my Samsung A7 2016 at the Mall of Africa Samsung shop. I was informed that they do not have the part in stock, they will have to order it and they will call me when the part arrives. I paid for the ordered part the same day (30 Jul 2020). I waited for the pat for more then 3 weeks. Every time I called the shop I was informed that they are still waiting for the stock from Samsung. I was tired of waiting and asked the shop to refund me the amount I paid for the part to which they agreed. Now I've been waiting for the refund to be processed since August 2020. When I go to the shop they keep telling me that the refund was processed but I keep telling them that the refund does not reflect on my account. They asked me to get proof from the bank which I did. I showed them my 28 July - 16 September bank statement. The payment I made on the 30 July reflects on my bank statement but the refund does not. I asked them to provide me with their proof of payment and they didn't. They keep telling me that they need to check with the head office.

Can someone at Samsung head office assist with this matter so that I can get my refund, please?