There's a couple of possibilities that I see:
- you're blind and cannot see the typo in the password
- you're trying to unlock using your WEB password; the correct password to unlock with is the GAME password, which you use to login to the S2 account at
http://www.lfs.net/
- this whole story is made up
- your mate(s) stole the account
- you bought a voucher and haven't used it yet
The TOU states one person per account, therefore purchasing one account for multiple people is liable to get you in trouble, and you may not be liable to get dev support because they do not provide it outside of the TOU. It's quite a common term of use, by the way.