If you have forgotten all of them informations to related your account such as ALTERNATE email address and secret Q&A and you're unable to access your account so you can be discussion to the yahoo with live chat.
1)Visit the link http://io.help.yahoo.com/contact/index?locale=en_US&y=PROD_ACCT&page=contact
2) Seclect, "Yahoo! Account "on the first on box.
3) Select, "Password and Signin"on the second one box when you selected the forgot password there will appear a third one box on there select "forgot secret questions & answers" on the third one box.
To the next.
Click, "Chat With a Support Agent online" and keep patient while loading a live chat after appear a live chat start to discuss to the live chat agent and then tell us to your problem and they will something arrange.
Note :That system can be worked on a laptop or computer rather then a mobile device.
Here you can submit a form with your problem to the yahoo help team.
OR,To further quries Contact/Call to the yahoo support and explain what's happend with your account.
Yahoo! Customer Service 701 First Avenue Sunnyvale, California 94089
Phone (408) 349-1572
Fax (408) 349-3301
Toll Free USA: 1-866-562-7219
How to reach a live person:
Press 2 when recording asks for
Hours of Operation:
Mon-Fri: 6am - 6pm PT
Email Yahoo at those addresses:
[Y Customer Support][email protected]
[Email Support][email protected]