I need major help. (xbox 360)

So heres the deal with what I did. I had just got level 130 (max rank) in halo 4 offline before the main title update. So I had all Armour unlocked and stuff. but then I signed in to xbox live and I was demoted to level 42. and nothing other than that happen. I noticed I had a bunch of armour I dont remember unlocking. I had deleted the game and sold it next week for BF4. I just bought back halo 4 digital and got on and played. I put on the random MK IV I dont remember unlocking and played some games on FFA. I ranked up and it said I was not able to earn anymore XP (BAN) and Im worried I will get banned from XBL too. I just paid $11 for this on sale yesterday and im banned. wow. any help?

By all armor, you mean commendation based ones aswell? Because that’s impossible by normal means, if you got it all offline.

I don’t believe you will be console banned, you probably AFK’d in a few games or got no kills, and the ban hammer saw this trend and XP ban you, since it is assumed that you were boosting.
The duration of the ban is something I don’t know, but I know the one in Halo : Reach is 1-2 days for the first offense.

whats boosting? is it like modding? most likely right?