I too am shocked and appalled by what has happened to your son.

However unlike others I am going to suggest that you don't change your sons school unless he really wants to. Your son may just feel like he is being punished if you take him away from his friends over this.

The teachers should be leaving not your son

Def put your complint in writing to the school board, these particular teachers may have had complaints in the past that may surface

I hope you go well with your meetings