First of all, let's find out if there has been such an incident in the school. In this case, ask other parents and consult with relevant teachers and schools. If negotiation fails, you can complain to the Education Bureau in charge of education.
Accommodation fees are charged by academic year or semester, and may not be collected in advance across academic years. Students who drop out of school or finish their studies ahead of schedule should refund their accommodation fees according to the actual accommodation time.