You can use this service to reset your Battle.net password, which will remove most account locks.
Use this page if you wish to change/modify your Contact & Shipping address for your Battle.net Account.
How to resolve this error when adding Balance to your account
Buying Blizzard Balance as a gift
Troubleshooting steps to help you connect to the Battle.net desktop app.
What to do if you can't open the Battle.net desktop app, and there are no error messages when you try.
Information on error BLZHROPAY10200139
Information on error BLZSC2PAY10200236
Unable to install Battle.net Application after downloading from the website.
What to do if you are missing Battle.net balance