my grandson being bullied

My grandsons name is austin he is 11 years old. He just started a new school and he is being bullied. Thé school he went to before he loved it never had any problems. He already told someone at school about the bullying but it doesnt stop the bully just gets meaner. My grandson wants to go back to thé other school but they wont let him. I even told him to have his room changed and he says they wont do it. I want to do something but dont know what. He thinks the bully will just be worse cause my grandson said something again.