Some parents won't accept that their children can do anything wrong or will not take any action unless it costs them money. My message to you young people out there is to take a stand. Tell your parents and teachers that you will not be brushed aside and will not attend school until the issue is dealt with, and then if it recurs repeat your stand. It is better that the bully be expelled than you lose out on an education because you can't deal with it. If you are threatened, tell about the threats.
Bullying is like sexual abuse.
The victim is threatened into silence, and the bully can only continue as long as you feel intimidated and keep quiet. Speak up, stand your ground, and insist that the adults around you take action against the bully. You do have power. You might not be physically strong enough to defend yourself, but you can use your voice and be strong in your insistance that adults deal with the bully. I hope this helps you.