Swiggy — entire item missing in order

Order #[protected], two egg biriyani's were ordered form the biriyani smoke house via swiggy. Online payment for the two was done in advance and i received only one biriyani. The delivery boy claims no responsibility and swiggy clearly denied any refund. Hours of chatting with the chat bots on their app and no resolution. Please act on the same. Refund for one egg biriyani amounting to rs 223 is expected.