Flipkart — Unauthorised

I ordered a phone with an exchange of my old phone. When the delivery date arrived, the delivery executive couldn't handle the iOS phone, so he insisted that I come to assist him in resetting it. The next day, when I went to collect the order, another executive told me I had to come down to the office, or the order would be canceled. He checked my phone, performed some tests, and informed me that my phone failed the battery and warranty tests, so I needed to pay an additional ₹2, 200. Two days later, I checked my Flipkart app and saw that my old phone exchange had been canceled, and payment had been made in cash without my knowledge.