Don't let these types get you down - remember they are total losers. They'd have to be to engage in such twattery, right
If you have recording software then get some footage of them cheating and then leave the server. If you don't have recording capability then just leave the server. Votekicks are pretty much useless and you don't want these cheaters to spoil the last days of your Crysis 2 experience.
Onwards and upwards.