Central Board Of Secondary Education [CBSE] — Salary issue

Respected sir/ madam
I was teaching in N.S PUBLIC SCHOOL, Katha, Baghpat from January 2020 till July . Due to lock down I started teaching online on school request . When I asked my salary the school denied to pay me and I left the School without pay. Due to lock down I thought they won’t ask fees from students and if the school compromise the fees than I will not take salary either, but After school reopening the school took the full fees from the students, when I asked for my salary they denied again .
My niece and nephew are also studying in the same school and they didn’t allow them to appear in the final exam as they denied to pay the fees for the period of lock down as the school didn’t pay the salary to the teacher for the same period and even threatened them to fail. Their parents got scared and they some how paid the fees.
I even complaint in the police station but they didn’t help me either. The school also said that I have never taught in this school because when I joined the school they didn’t provide me joining letter .
But I do have full evidence that I was part of that school .
I am attaching the evidence below . Please help me in this regard as soon as possible.
Sushma Dhaka
Baghpat