How to move a game account to a different Blizzard account
Changing language settings for game and/or communications from Blizzard
Blizzard or game account hacked or compromised.
It is not possible to merge the progress of two or more games into one.
How to move a Diablo III account off a Blizzard account
If you forgot your Blizzard account email, you can use your phone number to find your account.
You can change your BattleTag in Account Management.
What to do if you receive password reset mail without requesting it
How to consolidate multiple Blizzard accounts into a single account.
Information on using Diablo III Account Rollbacks after your account is hacked.