I would go back and INSIST on changing schools, and simply refused to attend if unchanged.
I suffered years of bullying and abuse at my crap comp. I didn't have the confidence to stand up to the teachers and parents when I complained about it and they did the typical "victim blaming" that was common in those days, i.e. "stand up for yourself", "hit them back", etc.
Even now, decades later, I still can't quite believe that they sat back and did bugger all about it despite knowing what was going on. I still can't believe the teachers were so stupid that they even continued to make me sit on the same table/desk with the very same people who they knew were bullying/attacking me!
Not only did it ruin my education, it has impacted on my adult life due to chronic lack of confidence, self harm, etc. It's only now, in my 50's that I've started to recover my self confidence and am starting to stand up for myself. All because of crap teachers at a crap comp.