Amazon — not received refund

Address:	441807
Website:	[email protected]

Sir, my name is pravin ramesh chetri. My address is at po. Bamhani ta sadak arjuni district gondia state maharashtra 441807. As i had ordered a mobile phone on amazon.in on date 18/02/2018
I got that parcel but when i received i saw the piece was defective the mobile had a problem in its display so i returned the product back on date 28/02/2018 by post but till now i didn't get my money back and then when i made a call in the company for requesting for my refund but they told that the box was blank... But i have all the proofs and details about the post i had done from here to amazon so please kindly accept my request and refund my money back or else i will put the complaint against your company
The product details are as follows,
Name - pravin chetri
Mobile no.-[protected]
Email - [protected]@gmail.com
1. Mobile name and model no.- |voom| me 5iv 505
[champerge gold].
2. Sold by - appario retail private limited
3. Order date - 18/02/2018
4. Return date - 28/02/2018
5. Order number[protected]
6. Product price - 4499 online payment