My Yahoo account has been blocked for 12 hrs. I do not have any phone number for reference but have alternative mail.Please anybody help me to get my account back.

Not here... we aren't Yahoo... thus we can't do anything you can't do. Actually we can do LESS than you because its not our account.

Please help me to get Yahoo mail. Yahoo management has blocked my mail.
How can I get back my mail to work. Please help me.

Yahoo management has blocked my mail.That's pretty much all you need to know.