You can use this service to reset your Battle.net password, which will remove most account locks.

Cannot remember Blizzard password and want to reset it.

What to do to recover your Activision account if you forgot your password.

How to reset your Diablo II (2000) password or change the email address registered to the account.

What to do if unable to change the Battle.net account password because the account email wasn't verified

Information about password restrictions and requirements for Battle.net accounts

What to do if you cannot log in after you changed your password

How to update your password if you are getting this error message

What to do if you have lost the password for the Blizzard Data file.

What to do if you can't reset your password in the Blizzard website