Discovery Bank: Refund Nightmare

Last year I bought a product from Takealot and had a number of issues with it. A one point Takealot had the device for 41 days before returning it with the recharge cable missing. Eventually they took it back and gave me a credit for the item. When I tried to turn the credit into a refund, I was told I could not as the refund was blocked by Discovery Miles a subsidiary of Discovery Bank. I contacted Discovery and was told that the issue was that I paid with a combination of miles and cash. The product was R8299. Never was I told that if I bought something with a combination of miles and cash a refund would be a problem. Now I cannot close my account with Takealot as I have a credit of R8299 due to Discovery Miles not approving the refund and due to the bad experience on Takealot I won't use them again.