I'm sorry to hear about your difficulties, ma'am. Your best bet is to use the Yahoo! Help forms to contact Customer Care and get this resolved. Specifically, you'll want to use this one:

[URL=http://add.yahoo.com/fast/help/us/edit/cgi_feedback]http://add.yahoo.com/fast/help/us/edit/cgi_feedback[/URL]

However, they won't be able to help you unless you can verify these:

Yahoo! ID, zip code, birthday, last four digits of your credit card #, or your secret question and answer.