Nearly got scammed at PVR vegas

Yesterday I went to see a movie in PVR vegas mall, dwarka. We ordered unlimited popcorn and cold drink combo they told us that they would deliver this to our seats and we agreed. When the guy came he gave us the combo and additional microwave popcorn and told us that they were given for free. I was little skeptical hearing this. After few mins they came with the card machine to take payment and they demanded 1650 rupees. Me being a person who regularly goes to movies knew the exact price of the combo which was 1358 I demanded bill first they said that they would only generate it after the payment I said cool I paid it and said bring me the bill now. After few mins a person came with the bill and I can clearly see 4 microwave popcorns were added for 75rupees each I asked them whats this for because I didn’t ask for these things and you have enforced me to purchase this they said its part of the combo and always has been like that and I have worked for 2 years in this hall and thats how it is always done. I said okay let me enjoy the movie I will talk to your upper management later and they left 15 mins forward a guy came with 300rupees gave it to me and took the microwave popcorn back.