L.B.
GET and PUT everything -- EVERYTHING in writing. After an in-person meeting, follow up with a letter stating what happened in the meeting; anything that was discussed and anything that was decided or agreed upon. Copy anyone and everyone who might have any interest or responsibility.
I had some issues with my kids' guidance counselor for a few years. Long story, but when it appeared my daughter would possibly not graduate due to a schedule issue, I lost it. I wrote a letter to the principal and copied the counselor, vice-principal, ALL school counselors, all deans, etc. and threatened that my next letter would be to the superintendent and school board. My phone rang within minutes of the principal receiving my letter. The counselor called later that day. But the principal PERSONALLY worked out my daughter's schedule for that semester.
Nothing I did or said over the phone or even in person got any response. My letter got an immediate and meaningful response.