Check the spam filters on your email. Everything from us comes from a blind noreply at Goa address and spam filters eat them. If you are using Hotmail then it likely got eaten before it even got to your spam settings.
First check in your spam-email-map.
If it's not there you should remember that they're not working 24 hours.
Have some problems myself when I'm payng. I get a message "Failed. You will recieve a email in 20 minutes so you can try again" or something like that, and I got that mail 10 hours later, when it was night here and day where they are.