If you don't see it in your email, check the message center on your xbox account. Make sure you're using the email your xbox live account sends emails too. If you don't know what email this is, login to xbox.com go to account settings and then click "Contact Preferences"
If you changed your contact email, you'll see which email you have to check here.
If its not in that email, or the message centre on your xbox, then you're SOL unless you can contact 343 directly with a complaint, because xbox support won't help you.