There really isn't anything you can do about a k-line. Chances are, even if you do email the address in the motd, it will be ignored. When you have a Internet connection, and you value it, don't let just anyone use it to play on IRC, you will end up paying the consequences. Additionally, you might 'pay' the price for someone on your ISP who cannot behave themselves. Again, nothing you can do but move to another network until or if the kline is removed.