JJV1OO5

I have been banned from Halo 4 for one week and it has been a week and I am still banned. My gamertag is JJV1OO5 and I do not know why I got banned in the first place. I just play Halo 4 with friends and last Sunday I got banned. I was not given a reason I was just banned. I waited it out a week even though I did not do anything and now I am still banned. I just want to get unbanned and figure out what is going. Thanks.