He just joined in the Creative server and straight took TNT and then ran off the building so I followed him and guess what he did? Going to peoples plots and destroying their things but of course its not his he cant break and he was placing them.... so now what happens to him?
You need proof of griefing before the Owners/Moderators can do anything. Take some screenshots. Also with the plugins etc. associated with the Creative server griefing should not be possible.