It's good advice and one I stick to, but that was one of the issues; I didn't get an email and neither did it show the upgrade until after the payment process was finally done and through and even then I only got one email. And you don't expect to be charged before you have filled in all the nessesary info. I was charged six times, while I only pressed a single button twice after filling in all the required payment details. Twice does not equal six so something went seriously wrong.
The servers were really overloaded.
Edit: I will drop it now to not get off topic and there isn't much to be done about it other than wait. The official forums are already flooded with posts about unauthorized extra purchases, so no need for that here.