Amazon India — Rejection of Exchange Product, Delay in Order and Refund

I wanted to buy a phone on Amazon under their exchange offer. I had submitted all details and conditions of the phone as per their format. But Amazon rejected the product for Exchange. I paid the difference and purchased the phone but this phone was a defective piece. And maybe the model itself has issues. There were issues with regard to call quality and software performance. Now, I try to return the phone under Amazon's policy. Their agents have verified everything but haven't taken the return yet. When I call customer care and check for status an automated voice says the order is processed and I will receive a refund by 21st March. That was 2 weeks ago. It's very hard to get any information regarding this on Amazon's portal or customer support. They don't even show the status of the return on the website. It's been over a 3 weeks since I've blocked my money with Amazon and without a phone.