Why not contact Amazon and see if they can sort out a replacement beta code? Tbh, it will probably be easier to cancel your order and re-order it again. Seeing as the game is not out for just over another two weeks, I doubt this would affect you getting the game for release.
There was a picture realsed last night, with the team, with a big cake with football manager on it, and them having a glass or 2 of bubbly, so think its getting nearer