Don't lie, Phazh doesn't ban anyone!
On a serious note, you team attacked intentionally and you did it to an admin... I don't think it needs much more discussion than "You broke the rules, you admit to what you did and that the ban was fair".
There is a thing called teamchat to ask him to stop but at the end of the day, if he wants to play Minecraft in cRPG, then he can, it's in the game for a reason.