Anyone who as a mistake in their Amazon order, don't worry. I just emailed them
to check with my problem and got this reply (the guy wasn't the best with his English but helped nonetheless

)
Thank you for contacting Amazon.co.uk.
I am sorry for any inconvenience this situation have caused to you.
I do understand that you have placed an order for Xbox version, however, it changes to PS3 version.
We're aware of the issue with the "Fallout Las Vegas" video game and are currently working to resolve it.
At this time we don’t foresee any delays with you receiving the correct version of the game. If we do experience any issues or delays due to this error, we will contact you as soon as possible by email.
Please accept our apologies for any inconvenience caused.
Thank you for your patience and understanding, and for shopping at Amazon.co.uk.