NIIT — fees issue

Address:

New Delhi, Delhi

Niit peeragarhi hr balvinder mam forces me to submit fees but the previous month i paid rs 20000. And my next due date to submit fee on 1 may 2019.
I totally paid to niit one lakh seventy thousand and also seema mam forces my parents to pay fee. Why should i pay the fee? When my fees submission date on may and his cashier kesav totally careless. He lost my fee receipt and could not maintain the record. Please action regard to my problem.