Do not forget that the child is scared and is affected now. You might want to claim everywhere you think it might help - IN WRITTEN (ask friends for help if you are too affected now to do it) - starting with teacher and up on ladder higher than that school.

But do not forget to move the child NOW from that environment. A good school's staff and board is priceless. My daughter was in such kind of school - a public school in Toronto - and I could see the difference.