Domino's Pizza — promised to refund the amount due to late delivery but won't do anything later

Address:

#18/3 vani vilas road, Basavanagudi, Bangalore, Karnataka, 560004

The order was placed on 21st oct 2019 at 8:46 pm and was not delivered in 30mins as promised. As the status was showing still being baked we called up the dominos cc, they said it will be sent in 10 mins. It was past 30mins hence they said the amount will be refunded as it was paid already. The order was not delivered even after an hr they kept saying it will be delivered in 10 mins everytime we asked for the time of delivery. The order was delivered at past 10pm and there hasn't been any refund or call from dominos as they promised. I'm calling them everyday but still don't have response and now they are denying from refunding. The reference number for the concern is #11731668 and the order number is 300.