That is exactly what I taught my daughter when she was in public school. Clam up and tell them to call me....immediately. Let momma take care of it.....and boy did I a few times. A couple of them came close to wetting their pants.
I’d be merciless. Sue them into bankruptcy. Devour their life savings with legal expenses. Don’t back off. I’d sue the school and the people individually.
Then again, I went to law school, so fighting these guys into poverty has special appeal to me.
For adults, I have always had similar legal advice if they are being bothered, leaned on, or otherwise harassed by law enforcement: offer your wrists for the cuffs and just say if you want to arrest me, do it. Otherwise, I’m leaving. Then don’t say a word.