#25 - Jan. 26, 2010, 9:01 a.m.
There are several reasons why a transaction may be locked - from a payment issue, to a question as to whether it was actually requested from the legitimate account holder.
In most of these cases, a call to Billing can help clear things up.
Billing and Account Services
Phone Support - 1 (800) 59-BLIZZ (1 (800) 592 5499)
Live Representatives Available 8AM – 8PM Pacific Time, 7-Day Support
E-mail Support - Billing@Blizzard.com
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
Our Billing Support page can be found at
http://us.blizzard.com/support/article.xml?locale=en_US&articleId=20606