Trying to prove my identity to yahoomail. But cant do it

Hello,

I remember my yahoomail id and password. But when I tried to access the mail it asks my identity. When I tried to do that, it sends the account retrieval mail to my alternate email id. which is NOT OPERATIONAL now.

The other options of mobile number / secret question are not appearing at all. I desparately want to access my account but I am stuck with this.

Kindly let me know how can I access my mails by getting the confirmation message in my mobile / through security question.
thanks