No, we can not do anything about it. Admins can search for his IP here and if he has an account he may be banned, but nothing more. Sorry.
RightClick
2012-03-20 17:32:01
Sorry for you, but after all, this is runescape !
Silentcore
2012-03-20 17:35:00
The only thing you can do is change your password atleast 2 more time.(he won't know old pass) and change recoveries, bank pins. And don't trust people anymore and watch out for malicious websites.