If the Education Bureau leaks the informer's information, you can complain to the Education Bureau. If the report is anonymous, the staff of the Education Bureau who answers the phone can report the job number during the phone call and record the phone call.
When necessary, recording is important evidence. If a staff member is dealt with by the school because of his disclosure, he can report the staff member and let him bear relevant legal responsibilities. If the circumstances are serious, a lawsuit should be filed.