Hackers and modders problem

Hello, i was playing a couple of hours ago infection in halo mcc halo 4 exactly when I noticed one guy looked weird he looked like a half survivor half infected just like the hacks and mods back in the day of halo 4 but then we played hivemind and then he was still there making fun of me cause he told me no mods but I have video evidence of this and then we played the very next game we played hivemind in halo 4 and the only one shot kill weapons in that gamemode is the shotgun and the sniper and we found and unkillable infected and when this guy was human he had a magnum and he was doing a one shot kill and it was different from the guy who was modding his look in one session, why isn’t the easy anti cheat not picking this up? I’m a Xbox player and this is ruining my experience cause infection is my favorite gamemode and is the only one that you can’t play without crossplay so what gives how can I get his people banned if I have video proof and the names?

For the moment we recommend heading over to https://aka.ms/HaloPlayerReport and file a report against the player you encountered, video clips are extremely helpful in these cases.