If you suspect someone of foul play, just use the Contact Us link at the bottom of the page.
Regarding the policy you refer to, I don't remember anything like this ever being stated. All game rules are described here:
http://www.piratesglory.com/rules.phpGenerally, same ip address is a bad way to detect a multiplayer. We have better ways to do so.
At some point in the future, we will finish a system where multi-play will not be beneficial at automatic restrictions.
Finally,for multiplay cases, all involved accounts will be banned.