One more thing, parents that were not only the parents of the bullies, but in some cases participated in it also didn't want to address it and ignored repeated attempts to rectify the problem. Friendships for several years could just be abruptly severed and no one even cared. Believe me...we tried many ways to solve this, but you can bring a horse to water and you can't make it drink. So sad and so the opposite of what is preached.
If there is bullying going on and teachers have not done anything, then as a parent you should reach out to the said bully's parents. If you've made repeated attempts and get no results, go higher up. Bullying is not ok. Ever. We've had a great experience thus far and look forward to enrolling another child next year!