My brothe in law body is missing in the river shilabati situated at west bengal in paschim medinipur district. On 21.09.2017 his family lodged one missing diary in local PS. On 20.09.2017 there was a immersion ritualsl of lord Vishwakarma in their ITI college. Tow body got floated, already 10 days to go but till now public and police administration cannot able to detect my brother-in-law's body and officially administration have not provided any information to victims family member.
So in this regards i wanted to lodge one appeal to DM (head of public administration in district) and SP (head of police administration in distirct). In this situation is there any law which I can quote in my appeal and what should be my appeal?