Amazon India — received a different product

Address:

B80 , 1ST FLOOR, STREET NO.13 , NEW GUPTA COLONY , NEW DELHI, New Delhi, Delhi, 110009

I ordered canon dslr from amazom on 5th dec worth 53900. On 9th dec, i received some headphones worth 2-3k instead of dslr. I am well aware that while opening packages of such big amounts we should make a video. Thats what i did. I sent this video and filed a complaint to amazon and they told me that they would investigate the matter and get back to me within 5 days. I remained calm for those 5 days but they didnt update my after 5 days. From then, i kept on writing to them via email and twitter on daily basis, but everytime they tell me they will update soon.
Its been 14 days now, i dont have any update till yet. Their return window of 10 days has also passed so i am not able to return or replace myself even if i want to. These guys are just postponing things and wasting the time so that they can eventually get away from this scam.
54000 rs. Might not be a big amount for amazon but is for a middle class persons like me.
I am tired of writing or calling to them now. I have lost my money and i didnt get the product i paid for.
Here is the proof (Link to video of opening the package, all the details are mentioned on label):
Https://Drive.google.com/File/D/1bYS4D_SB2jMSXIG_k25-CGjp5b1QpZUs/View?Usp=Drive...⇄

The order id is[protected]