Typical tactics when they know they are in the wrong and know you aren;t gonna just roll over and forget it....reschedule and reschedule till you hopefully give up. Know anyone on the school board? If you haven;t already you may wanna contact one of the board members and request a meeting with them as well. Also starting a written grievance and getting as many parents signatures on it to present to both the school and the board would be a plus as well...they REALLY fear anger in numbers...