This teacher speaks very rudely and abrasively to me, and she has lied to me about my son in front of others. Unfortunately, she has the support of the principal and one of the vice-principals. I've already spoken to the superintendent's office about the situation and they suggested I file a formal complaint. Would this make matters worse?
As for filing a formal complaint, it might cause more conflict but you will have to determine if the respectful treatment of your son and perhaps other students is worth the conflict. At this point you have taken some important and appropriate steps in trying to resolve this issue. I don't see that you have anything to lose by filing the formal complaint and you may have a lot to gain. Good luck.