Account has been hacked or compromised.
Changing language settings for game and/or communications from Blizzard
How to move a game account to a different Blizzard account
You can change your BattleTag in Account Management.
Phishing scams can take many forms—fake websites, suspicious emails, and threatening in-game whispers are the most common types.
How to consolidate multiple Blizzard accounts into a single account.
Playing Blizzard games on more than one platform.
How to move a Diablo III account off a Blizzard account
How to update the email for Parental Controls.
If you forgot your Blizzard account email, you can use SMS Protect to find your account.