Promises Much but doesn't Deliver - Literally!

I ordered wine which showed as being available and was at a good price. However, after going through checkout my on-line account showed a much later delivery date, longer than I was able to wait as it was for a party. Consequently I rang up and cancelled the order. I was offered alternative wines which were in stock and ready to ship but they weren't to my taste. The very pleasant guy on the phone apologised and said my money would be returned to my account that afternoon.
Thus far disappointing but not too much of a problem.
However, a few days later I checked my bank account - no refund. Slurp website showed my order as still live and now with a delivery date of early December! This despite the fact that I was told if I hung on for the wine it would only be a couple of days late. I contacted them again and was told that they couldn't understand why the refund hadn't taken place and would look into it straight away. True to their word they called back and said the refund had now been processed. Problem being if I hadn't checked then the order would have gone ahead when I'd already been out and bought alternative wines and the occasion had long passed.
Needless to say I wasn't best impressed and voiced my unhappiness.
Wine out of stock when showing as available is poor, but to promise an immediate refund and neglect to put it through is too bad.
Would like to give them another try but don't see it happening. I've lost confidence I'm afraid.