Disgusted at the service

Placed an online order, everything showed available (also I know that when placing an online order and the number of items are little, it’s survival of the fittest) Inpaid for my order and today the money is paid back into my account without any notification from the store as to what is happening and why. What bothers me the most is that I want to place another order to replace that one, now I willhave to pay another delivery fee, which I believe would have been avoided had I been notified bcos I would have asked that I replace the item. Also it’s not my fault that the item still showed as Available at the time I ordered, why do I have to pay another delivery fee to replace that item??