Why'd I get banned?

Games Halo 5: Guardians
1

I played a game of slayer on coloseum in H5
and whent 15-7
carried around an smg and Suppresor and after the match i was banned

i dont know why or for what reason but now it wont let me play arena or warzone. I dont cheat and i play fairly i just want to be able to play

2

Same issue mate just been banned for playing blackout

3

I was just banned as well. Doesn’t say how long or give any reason why I was banned at all., I assume that its related to the match I had previously where a guy killed me so I killed him back. Then he killed me and the process was repeated and when I killed him back I got kicked from the game. That’s the first time I’ve ever team killed anybody intentionally and all my games of Halo. Why would I get banned for that?

4

Same here. Banned for 3 months after I finished a game. Do any of you know how to get in contact with the people who banned us?