!As for getting a new xbox, maybe just bite the bullet and start a whole new gamertag/profile. Yeah you won't start off with the FM3 bonuses but at least you will be able to play great game. Just my 2 cents
If your tag was banned or the console itself was banned then there is nothing you can do. Nothing except for getting a new system and tag and not doing whatever it was that got you banned in the first place.