It's highly unlikely that they will give you the IP

They didn't when I was hacked two years ago. So the odds are they havn't changed their ways about giving IP's out.
But if you did there's lots of things you could do. The best would be to do a whois lookup on the IP then report it to the ISP. But then again we have the situation in which to a big ISP like comcast in the US, Verizon down there, or Shaw or Telus in Canada they most likely won't have time to pursue a problem from an online game unless it was something illegal in real life like identity theft.
To do a whois lookup if you did get the ip you could go to
http://www.dnsstuff.com if you want to know more please feel free to private message me.
Sorry about your account though.