Security Breach in Facebook: I removed Yahoo Email from Facebook but still can reset password using Yahoo Account which is hacked

Security Breach in Facebook: I removed Yahoo Email from Facebook but still can reset password using Yahoo Account which is hacked

I connected Yahoo account with my Facebook few months back. But my that yahoo account is no more with me. I removed that Yahoo Email from my Account Settings.
Probabily that Yahoo account is hacked
But when I enter that Yahoo Email in forget password, It gives me an option to reset the account.
Please help me how to unlink yahoo and Facebook.
P.S.: I have no longer access to that Yahoo Account.