Amazon India — Ordered mobile phone with 19000 and received box with stone in it

I ordered mobile phone from Amazon worth 19000 rupees on 2nd of October and got it delivered on 4th October evening. The package was ok and surprisingly I made a video while opening the product and to my surprise I received a box of some another phone with stone inside it. I tried contacting Amazon the same time and they ask for a timeline of three to five days to investigate the issue and that back to me but there was no mail or call from their side and when I called they denied to issue any sort of refund or replacement of my order now I have lost my 19000 rupees and also not received the product and Amazon is also not ready to support in any manner and disconnect the call while talking. I am having all the call recordings with Amazon where in the customer executive is accepting that my money has been wasted. I also mailed the video Amazon but they are not ready to provide any response. I am a middle class person and what this phone with my savings which has now been bragged by Amazon I would request you to please help me and take me out of this problem and get me my money back.