Expert stores not delivering after items have been paid for

I places an order on Sunday 24/07/22, the order was successful. I made an EFT payment. Everything was successful. Only to be told today that they don't have stock for the payment which they have already received. And now it will take 10 - 14 days to refund me. I am highly disappointed. As with other online retailers, it will advise you that the retailer is out of stock before the order can be placed.