Central Board Of Secondary Education [CBSE] — I am complaining against school authorities who are not relieving me after giving resignation

I was working with Bhai Parmanand Vidya Mandir School, Anand Vihar, Delhi-110092, from 15.05.2020 and due to personal reasons I had to resign. My contract got over on 31.05.2021, for which i gave my resignation on 21.04.2021 and worked till 9.06.2021. After sending continious reminders through mail along with phone conversation to the school authorities, the school is not clearing my well deserved dues for the month of May 2021 and not issuing me experience certificate and reference letter. I hope the prestegious CBSE will be able to bring justice to my complaint and I will get the deserved salary along with experience letter and reference letter.