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

Troubleshooting steps for resolving lock ups in Diablo III.

Troubleshooting for error 315000

Troubleshooting steps for crash problems

Troubleshooting for Battle.net desktop app crashes.

Troubleshooting for game crashes with error "The application encountered an unexpected error"

Troubleshooting steps to help you connect to Diablo III

This error message appears while logging in to the game with the message that the player was disconnected from the server.

What to do if you are seeing an error after starting the game

Comprehensive troubleshooting for any technical issue you encounter that does not have its own support article