Parking Charges — Mantra mall attapur charged 20rs.

I went to the mall to book tickets for the movie and it took me around 15mins there as there was some server issue of the online transaction of the Google pay I left and when I was exiting the mall they are charging people 20rs for parking inside the mall and when I argued with the person saying 30mins in every mall is free and then if provided with the tickets of food court or something then he started arguing saying I need to pay to leave the mall. Please take action over the mall for charging customers.