Amazon India — Received dummy phone and still no refund Order[protected]

Sir,
I ordered a Phone on Amazon on 3rd sept 2021 and phone was delivered to me on 4th sept 2021, In my absence firstly the delivery attempt was shown failed but after 1 hours it was handed over to building guard without verifying PIN that amazon sent me(Amazon activity logs mentioned below for reference) and without my consent. On opening the box, i was puzzled to see a dummy oppo phone got delivered to me inside a newly redmi note 10 phone box, i immediately informed Amazon and they said that will set an enquiry from transportation team. But Sir it has been 25 days since i have been following up with them and now after so many days their reply came today that they cant refund the money that i paid(16999) as it was delivered to me in intact phonebox although inside the box there was no original phone. Sir, as a Customer i din't receive the phone but received dummy model of oppo phone and if some scam or fraud has happened by delivery partner of Amazon(maybe they replaced the phone in Transit)it is their responsibility to bear the loss but not the Customer, Amazon denied compensation for my loss of 16, 999 that i paid in advance to Amazon.
Amazon reply was not at all Convincing, they simply disagreed to accept the issue or fraud has happened at their delivery end and rejected my request of refund.