Until he feels the consequence of his actions, he isn't going to "get it." I think he tells you he understands as a way of attempting to play the game in hopes that you will relent. I know it stinks to have to endure the testing, but you really are doing the best possible thing you can do. Now he can see that you mean what you say. There really is nothing more to say to him; you can't make him get it. In time he will and this will be a great lesson for him...Don't push Mom's boundaries or you loose!
Good job, Lies. It seems so much easier to give in to keep the peace, but in the long run, thast sure isn't easier. Hugs