Hi yesterday I play with some friends to obtain success in halo 4 dlcs, we allhad dlc so we had better chance to get success, but at a moment I received the essage about xp ban, i don’t know why, even I don’t think I have xp so much 
So please explain me why
I’ve read the topic aboutban and I did nothing of these things :
"
Manipulating network conditions to give yourself an advantage, or to the detriment of the experience for other players.
Modifying your Xbox 360 hardware or game software and services in any way.
Skill, EXP, or credit boosting, deleveling, idling through games, cheating, habitual quitting or any other type of unsociable and unsportsmanlike behavior.
Impersonating a 343 Industries or Microsoft employee on Xbox LIVE with intent to defraud or cause harm to other players."
Did you use extra controllers without players?