Dear XXXXXXXXX,

Go up the chain of command.  Start with the teacher's department head.  If you don't know that information, then go to the principal.  Document what was said and on what date and what ever witnesses observed this verbal abuse (maybe this teacher has a history of such behavior).  Bring this information to the principal and then ask him/her what steps he/she is going to implement to make sure that this situation does not happen to your child again (whether that is suspending the teacher or moving your child out of the room while an investigation is underway).

If you are unhappy with the solutions that the principal comes up with, then it is your right to go over his head to the superintendent.  Throughout this whole process, continue to document what is said or promised and the dates upon which this occurred.  This just gives your claims validity when you do bring your case to the superintendent.

If he/she doesn't resolve your problem, then take your complaint to the school board.  If they won't help you, then you might need to consult an attorney.  You could also get in touch with the local library or newspaper, tell them about your problem, and ask if they have any other suggestions for you.

Hope that helps.

Mic Sayre