I had ordered a Samsung A20 from Flipkart with exchange offer applied(Redmi Note 6 Pro). The Redmi Note 6 Pro was bought from Flipkart only and is in excellent condition. It's under warranty with Bill, Box and Charger. There is only one small mark/scratch on the back camera glass(no issue when taking photos). I have attached the pictures and bill of the phone. Today they came and rejected the exchange. What i can understand is that Flipkart expects the quality to be like brand new, never used sealed phone. I would recommend selling your phone in OLX or any forum rather than wasting your time with Flipkart.