Cinepolis India — Not allowing Frooti which was purchased from outside stating that its an beverage

Address:

City central mall mangalore

I had made booking at cinepolis mangalore screen no.4 for the movie "enna than case kodu" on 14.08.2022 for the 07.15pm show.
I had taken a bottle of frooti which had purchased from outside with me.
The security staff at the entrance won't allow me to take inside the screen stating that out side food and beverages not allowed. As per my knowledge frooti is a soft drink which differ from a beverage. I had made this complaint during interval time with the Manger of the theater. Still there is no use.
Although the company is serving food and beverages inside the theater why they are not allowing a drink eventhough it is not an beverage and doesn't have any security thread.