Customer Support can assist in recovering Blizzard Accounts if provided with necessary information.
Troubleshooting for error "Too many attempts" when trying to log in to the Blizzard website
How to consolidate multiple Blizzard accounts into a single account.
How to resolve being unable to log in due to this error
Can't log into Blizzard website or get online when logging with the Blizzard Battle.net desktop app.
Troubleshooting the BLZBNTBGS80000011 error.
Information on error BLZBNTAGT00000BB8
Information on the BattleTag Change service.
Information on Blizzard Phone Notifications
Account has been hacked or compromised.