Poor customer care

I ordered shoes on the crocs sale on the 18 Nov. Unfortunately, even though i ordered the same size as on my crocs at home, apparently the sizes changed and I ordered a W8, they sent a W10. Ok, understandable, I phoned when they delivered on the same day the 22Nov for them to exchange them. Nothing happened for 3 days, I phoned again as I was scared my size would go out of stock the reason why I acted quickly. They said they would send a mail with the amended order. Nothing. I phoned again x2, where the lady was not at work and would phone me back. Nothing. I received a call on thursday morning (the 26Nov) to now say my shoe sizes are out of stock! Oh then they would have emailed me again and again they didnt. Am so disappointed in the service AND customer care. I acted quickly to secure my size and type. They didnt now I dont have my shoes and I dont have my money, which I would have liked to just receive what I initially ordered(which was my correct size as well). I am still waiting for a phonecall and numerous emails that I would have received.