Hi Ice_Elfen and welcome to the community!
Sorry to hear that you are having issues with griefers. The best thing you can do at this point is send a Private Message to one of our Community Managers Hugo or Ignasis. Be polite and constructive, and provide them with as much proof as you possibly can (such as videos and screenshots). Let them know the server number and the accused perpetrators user and or clan names. However, do not list them here on this public thread or it will likely be closed. They will investigate and take action accordingly (probably a ban). The instuctions and rules can all be found in this thread. Good luck Ice_Elfen.
@Hugo, @Ignasi I think we may have some griefers at work here.