A BattleTag can only be updated for free once
It is not possible to move a Call of Duty account to another Battle.net account
Information on where to update your Activsion Account Email
How to change or update a Battle.net account email address.
What to do if your Activision account has been compromised.
How to pay with an alternate PayPal account
If you're seeing this message, check your email for details about the violation and a link to information on the appeals process.
Information on transferring an account between a parent or legal guardian and a child
Information on the deletion, transfer, unlinking, or moving accounts.