On line order - payment successful - no stock

I placed an on line order, due to no feedback following initial mail confirming order, I followed up telephonically, only to be advised that they don't have stock. I now have to wait for a refund even though the funds were deducted immediately from my credit card. My complaint is that when placing an order online surely if there is no stock of an item, you should be advised thereof and the transaction should not proceed. This has really been a frustrating experience with Red Square