Can't Matchmake on 360

I’m coming back to Halo 4 a couple of years later and I want to play some for old times sake because Halo 5 is about to drop. I can’t connect and I think I’m part of that group was mistakenly banned for downloading the Crimson map pack for free, as told to do by Micrpsoft, years ago. Why can’t I connect?

Have you checked your NAT?

I think I figured it out. My account was banned because my brother would dashboard like a little -Yoink- whenever he was on a terrible team or was losing. He quit too many times and so my tag is banned from matchmaking.