I understand. It is difficult to get through their procedures and I have no way to verify your information with Yahoo myself, I can only attempt to guide you to the best of my ability. I have found a way for you to explain your problem through a submission form, which I believe will be a way out of the "loop" we are currently in. Please follow these steps to be able to send a message to Yahoo to explain your problem. I am unable to find an email or phone number, but this is a submission form and should get the process started.
Please go to -- https://io.help.yahoo.com
Click on Account
Click on Hacked Account
Click on Received Alert that I didn't Request
When you click on this, you should see an option stating "We're here to help!" -- Email
Click this to begin the report on the issue. You may want to enter a second working email account so they can contact you.
Again, if this is the loop you are stuck in, I apologize. I can not see exactly what you have clicked and how far along you are in the process. I am assuming you are getting stuck somewhere in the loops for documentation, but you can let me know in more detail. I have looked at the pictures above and this seems to be further along than you were, and is also a method of communication with a person who can assist you. As I mentioned I do not see any direct emails or phone numbers to contact Yahoo, as they would likely get tens of thousands of calls a day, and for a free service (email) this would be expensive for them. Not saying it's right, just saying that is likely the thought behind why it is so difficult to contact them. Please let me know how far you get with this and if you have better luck following the above steps!