Service denied against the amount paid

I had ordered food from Zomato, consisting of 1 Afghani chicken and 4 tandoori rotis. The order was delivered to me completely spilled and not fit to eat. I paid for this order in cash. When I tried to raise a complaint, Zomato's customer support was not helpful. The AI chat support could not register my complaint properly, and even after I repeatedly asked to speak to a human agent, no one responded. I also hold a Zomato Gold membership, but this did not help me get proper support. I searched for a Zomato support contact number but could not find one. As the only option given to me, I was offered a coupon worth Rs 230 off on my next order, valid for 30 days. Since I had no other way to resolve the issue, I accepted this coupon. Only after I accepted it did a customer service representative finally contact me. I told them I did not want the coupon and asked for either a refund of the amount paid or a proper redelivery of the food, but both requests were denied, as I had already selected the coupon, even though it was the only option offered to me. I am a student and was left with spilled food that could not be eaten, with no proper resolution offered. I am not satisfied with the coupon as a solution. I want Zomato to either refund the amount I paid in cash or redeliver the order properly, and to improve their customer support so that genuine complaints can reach a human agent without difficulty.