Swiggy — food item not received and getting only half the amount as refund

I ordered 3 items in which only 2 items were delivered, but the bill from the hotel was mentioned 3 items. When raised the complain they mention they can refund only half amount in swiggy.
When the item has not been received, its common concept to return the food item amount which has not been delivered. Why are they not handling such basic issue. I wanted the hotel to call me so that i can mention this problem but i received response as they cannot arrange the hotel to call me.

Even a common person knows when there is no food no money can be provided. Here money has been already provided but no food and getting only half the money as refund.

Swiggy : [protected]