Ok everyone I’m just going to tell you all this method it was founded by Savior on HF but he said u could share it.
Step 1- recover the banned gamertag onto you console.
Step 2- go to the account management page and go to change windows live ID.
Step 3- have your computer beside you and go to windowslive.com and select sign up for a windows live ID.
Step 4- create a the windows live I’d then go to zune.netted sign in with your new email.
Step 5- this should bring you to the zune page were you have to fill out your D.O.B. leave it at this page.
Step 6- go back on your xbox and change the windows live ID to the one you just made on your computer
Step 7- go back on your computer on the zune page click next and it will log you in to the banned gamertag. Then just got to change zune tag.