what am i supposed to do?

I picked Zach up from ISS only to have the teacher from in school suspension at the Intermediate School tell me that he is the worst child she has ever had in ISS. She was practically in tears from all his torture. I don't think there was one rule he did not break. When trying to reprimand him she said he smirked while Saying "you can't hit me. You can't do anything to me." Since I have seen this smirk when he thinks he has gotten away with something, I know she speaks the truth. She said he treated her like a peer, spouting off at the mouth without stopping all day. And it wasn't just her. The other students in ISS begged her to make him stop, but Zach was not having any of that. I seriously am at a complete loss here. I want to deny him attending the baseball games Saturday and Sunday, but that just hurts the team. I can't stop shaking; I am so angry. The level of disrespect is incalculable to me. What am I supposed to do? I just can't do it. I am so sad. I can't stop crying. I am just so isolated, so alone.