My Daughter Was Threatened At School

My 13 year old daughter was threatened with violence by another kid at school. We have had problems with this other kid before, including unwanted touching. When my daughter went to the office to make a report about the situation they told her that she was not allowed to call me or her mother because "they just didn't want to involve the parents". The school never called either of us. We had to find out about all of this from my child after she got home. All I keep thinking is, any time an adult tells a kid that they can't contact their parents, something feels wrong. I am no lawyer so here I am, angrily writing this post in the middle of the night. I may be wrong but I feel like there is legal action that I could or should be taking. Could someone please let me know what my options are if any? This is a MO public school if it matters. Thanks.