If the responsible people are aware, in this case teachers, director and to a certain extend parents, but won't do anything, you did not cause enough discomfort for them to do something.
I'd have another talk with the teacher and director and make it very clear that this issue won't stand. I'd explain to them again why this is urgent and lay out my next steps if this is not solved. Those next steps may involve consulting a lawyer regarding taking legal action, going up the ladder above the director, involving the responsible government organization etc.
Make it clear that if they don't solve this problem they will get another 10 problems to solve very soon. Sometimes people need some extra good reasons to care for a problem that concerns someone else. Make it their problem.
