Dda Multilevel Gym, North Zone (Prashad Nagar) — Reg: Charging Extra Money

Address: New Delhi, Delhi

I am availing the services of DDA multilevel gym in North Zone (Prashad Nagar). Facility provided by DDA is very nice, but the person who is running the gym is charging a lot more extra money than DDA charges. He is not even providing the Identity Card or the receipt for the paid money. I am not sure where to complaint against this. Should I raise complaint in Consumer court? Please give me the solution or guide me where should I lodge complaint against it.