Recovering a Battle.net Account when the email address has been forgotten
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.
Troubleshooting steps to help you connect to Hearthstone
How to play Blizzard games in offline mode
More information about authenticator security codes