Bro, another weird problem.

I bought a phat ps3 unit from a fren.
Somehow i am an offline gamer until last month when finally my 4mbs line come.
Problem is the main user has activated the psn and the username is there with password not save. I tried to ask the password from the previous owner and he claimed he forgotten the password and the birth date he put. (PS: He even didnt reliase he bought a 40gb phat unit overseas which is told by the seller as 80gb. He never check)

So, is there any way that I could log in my own psn account using the main user. I have to create a new user in order to log in. (T.T My precious trophy) Whenevery i try to login using main user to my own psn account, an error sure occur. I even try to call to US PS3 support and they say they must have a US phone number for the troubleshooting. I duno how.

Please Help!

Problem is i failed to delete main user. Seem not an option =.=