Swiggy — missed item cost 192rs buy coupon issued for 50 rs only

Address:

Chennai, Tamil Nadu, 600082

Today i ordered 4 items, but only 2 got delivered, after complaint 1 item got delivered and for another 1 swiggy issued coupon worth Rs 50, but the actual item cost 192, when i asked for the remaining cost they just closed the chat as they cannot issue or refund. This is a big fraud, how they can issue 50 rs coupon for 192 rs worth item. How can i approach this legally to get refund