#1 - July 13, 2010, 8:57 p.m.
This isn't showing locked, so I suspect you've been assigned a new serial number.
In a case like that, calling Billing is the quickest means to get this resolved.
Billing and Account Services
Phone Support - 1 (800) 59-BLIZZ (1 (800) 592 5499)
Live Representatives Available 7 days a week, 7am to 8pm Pacific Time E-mail Support -
[email protected]
Players in Australia should call 1-800-041-378
Players in Singapore should call 800-2549-9273
Players in Chile should call 1230-020-5554
Players in Mexico should call 001-888-578-7628
Players in Argentina should call 0800-333-0778
All other international players should call: (949) 955-0283
You can also utilize this webform, but it may take just a bit longer.
http://us.blizzard.com/support/article.xml?locale=en_US&articleId=26361