Amazon India — refund not received from amazon as requested

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I ordered Honor7X smartphone (Costing Rs.9999) for my Dad on 10th Oct 2018 from Amazon which was supposed to be delivered at Hinganghat. However, Amazon delivered a wrong Phone (Redmi6A) consisting the Invoice of Redmi6A with 3rd person’s name on it. I followed the traditional way of replacing the product. I also talked to Customer care mentioning my grievance, they said the phone must have got replaced and the problem should be resolved soon.
When Amazon found out that the phone was actually replaced, they agreed to send the courier service to return back the wrong phone (Redmi6A). Since Hinganghat does not have Amazon’s Hub, delivery and the return is carried out by a local courier service. However, Courier service would not accept the return since Amazon didn’t send ‘reason for replacement’ to that courier service. This happened multiple times.
Post which Amazon’s Customer care asked me to carry out self-return. I followed the procedure and completed the self-return through another courier service named ‘First Flight’. I also mailed Tracking ID of the courier (Redmi6A) to Amazon. However, post stipulated time when I followed Amazon’s care back they said the product cannot be tracked and to ask respective courier service to send the valid Tracking ID.
On getting back the courier service (First Flight), they tracked the product which said, Product was rejected by Amazon. It’s been over 1 month now that the courier is not returned to me. When I get back to Amazon’s Customer Care they always reply that the product is not reached to our hub and it cannot be tracked. So Finally I end up having neither any of the 2 Phones nor my money (Rs. 9999).
You can see how reckless Amazon is to provide service. Customer care personals are Robots who states the same thing and assures to resolve the problem which they never do. It’s been over 2 months from the day of order placement and you can see a lot of effort and time was spend for nothing.
Finally, I desire to get the refund of my money (i.e. Rs. 9999) from Amazon.