Another Tiscali mail issue

Hi, as others, and responding to your post about getting in touch, my wifes tiscali mail account is no longer accepting the password. We are no longer Talk Talk customers, having left after the hacking issues from last year hence cannot change the settings in my account.
 
How do we proceed to provide the required info. to get the pasword reset, i do not want to post personal information on the forum?
 
Kind regards, Mark