Online disaster

PNP ONLINE had a special on the 15&16 October, all beers 20% off etc. I placed my order for 2 cases of Castle Lites 340ml bottles and 1 Bombay Sapphire on 15th and the order and payment went off no problem, for delivery next day. The night the full amount gets deducted off my bank, delivery arrives next day just to see only the Bombay and no Castles Lites!! It is listed as "Not supp****" on invoice. I call help desk who just says that there was probably no stock in the store. And that is just the end of it?? I paid R60 for delivery just for one bottle of gin, which actually ended up then costing me more money than market value. How can an online shopping service operate this way?? The difference has not been returned to my bank account either. I knocked my head a couple of times with PnP online and I just decided to give them one more go. Silly me, I guess. More stress than anything else. I actually ended up LOSING money not saving.