Amazon India — not getting cashback

I have ordered from swiggy on 22nd august from the restaurant the delhi zaika, jogeshwari east mumbai and have paid the respective amount of rs 416 through amazon pay balance. As mentioned in swiggy's app, there is a 40% cashback amount if the payment has been made through amazon pay balance, which i did. But the worst thing is that i haven't received the cashback till now. Its been more than five days and i have also contacted amazon guys many times and every time they said its a matter of swiggy and we can't do anything in it. But when i have contacted swiggy they totally refuse to handle this problem and tell me to contact amazon because the payment has been made from there only and it's their fault that i haven't received the cashback. I am seriously fed up of amazon and its pathetic customer service. Order no #[protected].