Swiggy — product not delivered

I ordered red velvet milkshake from drunken monkey restaurant. Swiggy updated the order status as delivered but i did not receive the order. I informed swiggy about this and they gave a swiggy coupon after late night. I was not able to place any order that day. When i wanted to place an order, the swiggy coupon got expired. The money which i paid swiggy is real but the coupon expired. Please help me get my money back as i did not receive any service. Please note that i called swiggy 3 times to register a complaint. They confirmed me in call that it was their fault that they should have informed me about the coupon expiration and assured that i will get a call back in 24hours in response to the complaint. Its been 3 days and no response. I am tired of calling them again as it is difficult to explain the same issue again and again. They are playing with my emotions.

Swiggy order number: [protected]
Order amount: 228