For what we pay Yahoo is giving the service they can afford giving . It is our fault that we rely on a free service for important functions..
customer service is people intensive, and people cost money.. if you do not pay for the service you receive you should not expect a better service then the level that yahoo can afford giving you..
We must remember that when we use yahoo, we are at the mercy of Yahoo. they can decide to shut down email and there is nothing we can do about it... The agreement we sign when we accept the term of use are totally one sided, and since it is free we agree to it.
If email, or messenger is an important function for you life or business, then get a premium account or switch to a paying service and you'll have some rights and customer service.
I had the same problem about a month ago, and I was amazed that I could actually get a service rep on the phone, and that eventually (after faxes and emails) I got my service back... and FOR FREE!
WOW! what a county!