Sri Chaitanya Techno School — hostel staff

My son is studying in sri chaitnya school cbse ecil branch.. There hostel warden and other staff are very rude even they abuse our child and also beat them.. If any child is suffering from health issues they didn't respond properly and never take care.. If we calling to them they don't willing to talk to parents or they didn't pick up the call.. It's very harassing to parent they leave their children on faith of school staff. Even principle of the school never took any actions against such type of bull sit.. They're only enjoy fees provided by us.. My son suffring from fever but they don't properly visit doctor and take care. What should i to do right now? Should i go for police fir? Please suggest.