Hello!

I have a yahoo account which i had created some 7 years back. Now my this account is being hacked.
Now the issue is:
1-Security questions are not being modified. Whenever I modified security question there is link of old security questions through password recovery method. Hacker knows the answers of these questions and my account is being hacked again and again.
2-Through password recovery method, E mail ID that are provided for password recovery is not visible and being shown as ******@domain.com. But for my old account all the linked up emails accounts are visible.

Is there any way or solution to cope up with this issue? The hacker had made many attempt and really created a mess for me.