Got banned on halo 5 for no reason

Sorry to hear that you experienced this. However, there is nothing anyone in the forums can do to assist with this. You should contact 343 studios since it was an in game ban. Good Luck!

and when i got my account back after a week or so my halo 3 was banned for no reason

Hello BadBuddyLee. You are correct being banned for being a female or for skill level are not good reasons to ban a player. The in game ban message should also give additional detail as to why the account was banned and for what
duration. I'm quite sure your account was not banned for the reasons you mentioned. As others have mentioned there are options to appeal. I would also suggest reviewing the sticky Official Halo 5 "why was I banned?" thread found Here

I checked your Halo 5 game history at https://www.halowaypoint.com/en-us/...ons amer?gameModeFilter=All&start=20&count=10
and during the last month there are quite a few games that say DNF i.e. you did not finish. This is the reason you might have got banned because you quit the game before completing and you might have got reported by your team mates in the game.

For information about your ban and to see about submitting a case review, you would need to go to http://enforcement.xbox.com