The Saboteur Midnight DLC not working?

I received a factory sealed copy of The Saboteur for Xbox 360 a short while ago but the free code in the box is not working. The code is four sets of fours letters/number with hyphens between every four letters/numbers. I have tried entering it in the download section in game but there's no option to put in hyphens and it doesn't auto do it. It doesn't accept the code if I type it all together, in lower case, in upper case I've even tried entering letter for numbers instead of numbers in case it was a miss print or something. Help?