Two e-mail accounts with mutual e-mail recovery

I have 2 mail accounts: x_at_yahoo and y_at_yahoo.com
Unfortunately the recovery mail of x_at_yahoo is y_at_yahoo.com and vice versa.

On both accounts, when I try to sign, I found this notice: “Are you travelling?... You’ve never accessed before to the account from this location… (by the way it’s always my home), You’ll receive a mail to the recovery mail address, type the code written on the mail. Of course is impossible for me to access and read any mail.

Any suggestion? There is a way to write to yahoo support? If I follow the menu about the problem starting from “I can’t access…” I continuously run around without finding an address to write to or a solution.
Thank you in advance.
Paolo