Swiggy — missing item in order no #[protected]

Address:

Ashok Manasarover flats ,44th street, Ashok nagar, Chennai, Tamil Nadu, 500083

Ordered cold coffee and brownie combo along with other items on friday 17 may 2019 for ₹244. Restaurant called and informed there is no cold coffee but there s only brownie. I said give me some other item and there was no substitute offered. I received only the brownie and no cold coffee or any other item.
I complain on the missing items to swiggy i can only see them wasting my time and sending automatic replies and nothing concrete. I again follow up today and they say they can’t process refund beyond 24 hours. I made a valid claim on the same day and they did not respond and now they cheated me. Cost of one brownie alone is ₹135 so i paid nearly ₹100 extra for nothing. This s not a big money but they can’t chear me like this. I have proof of chat with the customer executive