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

Information about password restrictions and requirements for Battle.net accounts

Cannot remember Blizzard password and want to reset it.

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 on the Blizzard website

Troubleshooting steps to help you connect to the Battle.net desktop app.

What to do if you can't complete a purchase in Battle.net Shop when asked to type your password

What to do if you receive password reset mail without requesting it

This is how to check if there is an error that the password is not correct