Refund not credited as promised

I processed a return on the 25th April 2025. On the 26th April 2025 the app was updated saying that the my takealot account was credited. After several days of not seeing the credit I called to follow up. They advised that an email was sent was a coupon code. I advised them that I was not able to access my email at that time . They said they would investigate and come back to me. I then had to follow up a second time. Only to be told again that a coupon was emailed to me. I once again advised them that according to the update on my return the amount was to be credited to my takealot account. And that I could not received emails. I now get a email saying that the coupon code expired and there is nothing they can do about it.

So what happens to the money due to me??? Why say that it will be credited to my takealot account if it was not. I was unable to access emails so how would I have known that a code was emailed to me. This whole process has not be handled professionally and I would like my refund to be credited to my takealot account as advised.