As wronsiski said, you can't expect a staff member to be in every single server, watching every single player, 24/7. If we did that, about half of the players would be staff members.
As a player, you too have a duty to report rule-breakers, or at least bring them to our attention. At the very least, you could have noted these hackers' names, and we would watch them if we had seen them in-game.
In the future, either record them using a screen recording device such as
Fraps or
Bandicam, or download
TeamSpeak and poke a mod (somebody with an iron sword next to their name) on our server at ts.mcsg.in.