Inox Leisure / Inoxmovies.com — Exorbitant price charged for cold drink

Address:

10/3, Elgin Road. Kolkata700020

I went to Inox, kolkata, Forum Mall on 3rd June 2023, to watch 7pm movie show . I ordered for a cold drink 675 ml, for which I was charged Rs.328/- without tax.
I was shocked to pay this such exorbitant amount.
When 650 ml cold drink in open market is charged rs.35-Rs.40/-, how come Inox is charging Rs.328/-.
This is absolute crime.
Why is such huge difference in price?
What is the difference amount for? Service?
Please clarify.