Find person X.
Make sure you are face to face with person X. Please check his ears are unplugged, that there is no excess noise in the environment, and wait for him to terminate any phone calls or the like.
Tell him, in any language they surely understand, using clear and calm voice, that they're not welcome back to your game.
There.
![Small Tongue](images/smilies/smallstick/smalltongue.gif)