Account has been hacked or compromised.
How to resolve being unable to log in due to this error
Changing language settings for game and/or communications from Blizzard
How to move a game account to a different Blizzard account
World of Warcraft accounts are assigned a name on creation, would like to change that name.
The login servers received invalid information
How to consolidate multiple Blizzard accounts into a single account.
A BattleTag™ is a player-chosen nickname that identifies your Battle.net account
Information on the BattleTag Change service.
Missing mounts, pets, achievements, heirlooms, toys or appearances missing after transferring one WoW character to another Blizzard account.