Can't log into Battle.net website or get online when logging with the Battle.net desktop app.
How to correct or update the first name on a Battle.net account
Troubleshooting steps for communication and transmission errors.
Customer Support may ask you for your PayPal billing agreement ID or your order invoice ID when assisting you with a refund
Blizzard servers could not be reached or may be offline.
How to play Blizzard games in offline mode.
More information about authenticator security codes
What to do when getting an error that the Battle.net Account has logged in somewhere else.