Swiggy — No refund provided for items missing from my order

Order id- [protected]
I had ordered a total of 5 items from Swiggy instamart from which upon receiving I find out that one item is missing - Bread worth 65/-
The order came in an open bag with no tape or bill attached to it. As the order was prepaid the delivery quickly handed the order and left. Upon raising the he customer care denied my claim to a refund . The amount is small but I feel cheated and exploited . This incident illustrates the power dynamics between big corporate and a vulnerable consumer and that is why I want to challenge it.