FYI, I pre-ordered Star Wars Battlefront through Green Man Gaming. They fucked up, oversold it, and as a result I wasn't able to start playing the game on release. I finally got my key about halfway through the day (on a day I'd taken off, no less). Recently, everyone that pre-ordered got a few days head-start on some free new content (Jakku maps). I didn't get access, and I'm sure it's for the same reason.
So... that is the first and last time I ever do business with Green Man Gaming. I suggest you guys think twice before dealing with them as well. BTW, they reportedly were going to compensate their customers by giving out a 30% off voucher to buy another game... but why the hell would I pay them more money? Besides, I never got any voucher.
I've bought games from them before, but only sporadically and never new games. I think that's maybe where you got screwed. 