Swiggy — Wrong portion advertised and delivered

I had ordered for a chicken dish on Swiggy through a restaurant menu. The dish was advertised as a plate full of chicken but when it was delivered, it was a half-empty box with just 5 pieces. The dish was approx 240Rs including delivery and gst. Swiggy was offering me 49Rs. refund coupon even after complaining to them about the portion with picture evidence. I emailed to them and they have send me automated reply mentioning that they r disappointed and will take care in future but totally stayed away from offering me a valuable compensation for the inconvenience and deceiving advertisement. I need to take severe action against this.