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

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

Cannot remember Blizzard password and want to reset it.

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

Information about password restrictions and requirements for Battle.net accounts

Troubleshooting error 500 on a Blizzard site

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

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

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

How to modify your emails for to allow important Blizzard and Battle.net messages to go to your email inbox