I'm sorry to read that, ClumsyMum. It's not very professional of them, especially as their website shows the game available and in stock. I imagine that you will be contacting them so I hope things get sorted out for you and it arrives quickly.
I don't have mine yet either. Not ordered from the same place but from somewhere that I use often. Things generally arrive very promptly, I've only ever made two pre-orders from them and they both arrived on the day of release. My copy was posted on Wednesday, it just hasn't arrived yet.
Isn't it frustrating?