Leave encashment

I was working as an Admin.Officer in a School in Pune which has no Govt.Grant but run by The Parsee Charitable Trust. The Principal is very dominating and like a dictator, who threatens the staff by using her power of being female & a wife of The Major General in Indian Army. More than 10 Secretaries haveleft the job in 5 years of time, who were directly reporting to her. There are more than 30 staff who are working more than 5 years as temporary staff and paid on vouchers without PF and without an Appointment Letter. No leave record, No leave register for them. Permanent staff has 10 days of Diwali vacation, 25 days of Summer vacation and 12 days casual leave, i.e. total 47 days leave per year is allowed. I was not allowed to avail any leave. I have worked 47 days X 5 years = 235 days. That means I have worked for 5 years without any leave except Sunday. This is just because of her own rules & regulations. In fact I was not given an Appointment Letter at the initial stage but after 4 years my signature was taken on the Second copy of the Appointment Letter and taken it back without giving me an original copy of the Appt. Letter. I was forced to put a date of 4 years back. This was done by a school’s Advocate and a Librarian and an Accountant as per the instructions of the Principal Madam in her presence. She always pass the derogatory comments to insult the staff members including myself. She has called me Chakka/Hizada infront of all too. I resigned after 5 years with proper notice period. I received my last month’s salary as well as PF & Gratuity. I applied for the Leave Encashment with many reminders but no response. Please advise.