MY XBOX HAS BEEN BAND AND I DONT NO WHY IT IS NOT CHIPPED OR ANYTHINK SUM 1 PLZ HELP ME AND WHO DO I CONTACT
You can't. Once a console is banned, it's banned permanentely.
Did you buy it second hand, if so, that's probably why. The previous owner may have modded it.
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Here is all the information available about console bans.
Console ban FAQ.