Flipkart — Empty box delivered in intact conditions instead of oneplus mobile and return request continuously rejecting again and again

Flipkart big scam with me.
Respected Sir/Mam, Please help me with this scam which facing on flipkart shopping.
Ordered Oneplus mobile amount of 19739 paid full amount but they Delivered Empty intact percel there are complete items Missing. Flipkart 2 times return rejected. thier all customers support not solve the issue seriously avoiding my refund. we earned money by doing hard work now facing loss now feel die only for flipkart shopping. Please take action on it and refunded my money. more than longer waiting for refund please refunded.