why banned and how long for??

Hi i was wondering exactly what i did for the message to pop up saying my Xbox 360 console has been temporarily banned. My gamer tag is Alligator Eyes. Like i know i had some guest signed in with a friend because we was going for some achievements but i played almost all of the games and didn’t really kill my guest because it was team objective. Also how long will i be banned for because i hate not getting credits and its not like im meant to do anything wrong just trying to get the last 3 achievements i need to finish off halo reach please respond as soon as you can thank you

I’m going to redirect you to the thread about credit bans in Halo Reach:

Why did I get banned? The Official Thread