Legal Credit Reversed on my Account???

I went to Edgars The Grove on Monday the 1st of October 2018 to return a belt I had bought just over a week ago. The belt had snapped and was not fixable. I asked for a refund and it was put through my credit card as I had purchased a couple of items on my credit card on the day I purchased my belt. The credit went through on my card, now that I check my bank statement (3 Oct 2018) the credit has been reversed... why? Edgars now owes me R 299.95!!! When are you going to re-credit my account?