M.M.
What would I do?
In 5th grade I pulled my daughter out and now homeschool her. That was a shock to the school and I had teachers calling my home promising it would be different, that they would take her and protect her, sorry, they had their chance.
We have moved several times and I have dealt with many school districts.
I have gone to the superintendent in two districts. Once this resulted in us having a choice of any elementary school in the district.
We sent the girls to Christian school. THis was a very good solution until we moved.
Document everything like you are doing. Write down what ahs happened before even if you can't remember dates.
If you have exhausted the school's chain of command then go up to the superintendent, then the school board.
You can do this. Sometimes it feels like you are the only one. Don't be complacent.