Help! My WarGames pass no longer works!

Hello,
So, yesterday I reset my xbox 360 to factory settings in order to solve a hdmi issue. I then continued on to restore my account(worked perfectly) and I played halo 4. However, I couldn’t play halo 4 dlc playlist. At first I thought I had to download the mappack again but I couldn’t. I bought the Halo 4 limited edition so I don’t want to lose the mappack. If you’re from 343 please help me. My gamertag is virtualpainter and you can check my achievements. If you’re from 343 I could tell you my yahooaccount and if you can help me please comment telling me what I could do.
Thank you for reading!