Ok, so I finally got through the process of exchanging my code for a disc, and it took almost an hour.
the official site states this:
As long as your code isn't used then you can use the swap code to disc process. and provide your Gamertag, Email address, the Game code and your mailing address. and a disc will be sent out to you in 3-5 business days.
well, that sounds great, but that's not all you need and shipping is far longer.
You need to also provide a photo of the receipt, your consoles serial number and then wait 10 business days.
I don't mind the extra steps had I been aware of them, and giving false shipping days on your official site is wrong. had they stated you needed the extra information as well as updating the shipping times to 5-10 business days.. then ok.. but as it stands, the official site is giving false information and incorrect steps.