Unable to update or add mailing address

I am completely unable to update my BatleNet account mailing address, nor can I add a new one and delete toe old one. I have MOVED and I need to do this, but I have NOT changed countries or regions. All troubleshooting topics on update mailing address fail completely - the error always is “Unable to save new address”. And I can never get to page where it lets me open a ticket. Any suggestions?