Zomato — not getting refund : bad food quality

This is regarding zomato order for which i am eligible for refund as the food quality was very bad. This was not goot to be consumed by human.
The total amount of order was 221 inr. The zomato chatbot generate a coupon worth 186inr automatically. But i do not want any coupon or discount but a total refund in my account.
Zomato has refused to provide refund. It someone is not willing g to have coupon then they should provide refund in their original payment method.