Blizzard or game account hacked or compromised.
Changing language settings for game and/or communications from Blizzard
You can change your BattleTag in Account Management.
How to move a game account to a different Blizzard account
How to consolidate multiple Blizzard accounts into a single account.
If you forgot your Blizzard account email, you can use SMS Protect to find your account.
Playing Blizzard games on more than one platform.
How the silence penalties work
Change your Blizzard account email address.
Information on the possibility of merging progress, purchases, and/or characters on separate game licenses