I honestly believe the Consumer/Customer in this case. I must say I am VERY disappointed with Microsoft.
This guy gave a copy of the receipt, played a legitimate version of the game, and Microsoft still banned him.
As a school teacher, I have a LOT of students who are gamers. We love talking about games, and they think it's cool that their teacher is a gamer. This is a story/scenario that we have discussed and basically scares my students. They didn't know that Microsoft could ban consoles/accounts, or even that they would in a situation like this. It has also provided fodder for their fan boy system wars they have when we discuss games.
I would like to thank the OP and Microsoft for providing us with an great scenario that we have since used as a persuasive class debate. I have summarized the story, changed the names, and I have students take a side, the Consumer or the Corporation. Honestly, my students hate being the corporation because they cannot wrap their heads around why they would ban the consumer for playing a game early. I have given them reasons, but it still comes to the bottom line "If the game is real, and they bought it from a real store, then why are they banned for simply playing it early?"
They have a very hard time arguing that "Yes, we should ban the customer for playing this game early!" I think this whole ordeal is simply embarrassing for Microsoft and just overall very disappointing.
Something else I would like to add, I waltzed into Meijer one day and saw they had Killzone 2 on the shelf for sale a FULL TWO WEEKS EARLY to the day. I picked that bad boy up and that evening was playing with the actual developers of the game online. We had a great time, talked about the game, strategies, etc. They never once asked me where I got the game, how I got the game, or anything. They did ask "Where are you from?" I told them and we kept playing. That was a lot of fun! Also, a totally different attitude towards me playing the game early.