use password recovery form.
you can recover / reset passwords vie email, mobile phone (sms message), or even via phone with the9.
here it comes: you will probably need a matrix card to have been used. installed (maybe). but you will for SURE (just checked) need the password / ID card number used on registration.
i said so several times, a year ago. theychanged it, and they are even offering the option, in case you dont have your number, or forgot it or whatever, to change the passport number (this makes your account 1 week unavailable. deadanus did so).
if you guys NEITHER installed a matrix card, NOR used PIN1+2, nor did email and mobile bind on your account, and never wrote down or changed the passport number, then it simply means you didn't care enough about security and/or recovery.
sorry for being harsh, but it had been said several times by me and others. and seeing people whine now, .... well ...., all i can say is : told ya.
There isn't much you can do, except calling the9, maybe they will ask you for some sort of fax confirmation and so on. good luck, but as you lack on giving information of your case, it makes it hard to estimate your true problem (hacked account, password mismatch, etc....).
in any case......
LEt IT BE a LESSON TO EVERYBODY, AND PLEASE, IF YOU CARE ABOUT YOUR TOONS, THEN CARE!~
Come and join on Starcraft 2 as well =]