Flipkart India Private Limited - Delivered a defective device

I've ordered my Xiaomi Redmi Note * Pro Space Black *GB ** GB mobile (Order date was *th August **** as promised delivery date within * days) from Flipkart. It was my *th mobile from Flipkart just within * years of time. I didn't get the product as they promised. Finally, I got the delivery after the long waiting on **th August ****. On the **rd of August, I felt like the mobile camera was freezing and there are some cracking sounds from the speaker. I've called the customer service and complained about the matter and they arranged a technician (From Jeeves Company) to visit and check the device. The same day the technician visited and formatted the device. He told me that after restarting the device everything will be fine. He was on a call all the time. He doesn't know even how to do the factory reset. He was working as per the instructions getting from the phone call from his superior. Even after that, the problem was still existing and in addition, the system was getting hot. When I mentioned it to him he said I can't do anything. I've called to the Flipkart customer service again the same day and explained all these things. They stated that the technician has given a fake update and will arrange another technician from the same agency (Jeeves). The second-day technician has come and rectified the problems. He told me he will forward the report to the concern and Flipkart will contact you. I waited for the update from the Flipkart and didn't get a call back from Flipkart. I called them again and said that the problem still existing. I requested many times for a replacement or a refund. I keep calling them and they keep saying that the concerned team will contact you and on or before this (giving me a specific date) you will get a resolution on this case. Today morning (** Sept ****) they called me and told me to contact the nearest service centre to repair the mobile. I refuse to repair and requested a refund or replacement instead. After the call disconnected for the last time I've called them again and asked for any superior or senior executive but they keep saying to visit the nearest service centre and repair the mobile. As per Flipkart return policy, there is ** days time period to return the product. I've contacted them so many times from the *th day after delivery because it's a faulty device. I'm really tired of contacting and explaining, again and again, the same every time. It's a brand new mobile and delivered a defective device. It's their responsibility to replace or refund. Now they are saying that the seller refuses to replace or refund. Please see the attachment for the same. When I open the camera this what's showing in the display. Please refer to the attached.