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.
How to move a Hearthstone account off a Blizzard account
Playing Blizzard games on more than one platform.
How the silence penalties work
If you forgot your Blizzard account email, you can use SMS Protect to find your account.