Amazon India — No solution to my query

Address:

Gurgaon, Haryana

I purchased a xiomi mi4i 16 gb model from amazon.in on 31st of july 2015 with cash on delivery. There was some defect in that piece, so i returned that on 7th of august. I have return slip with me. Now the drama starts. On 12th of august I got a mail from amazon that we tried to refund your amount but there was issue, please update your account details. I updated my account details. When I called in amazon india care they told me that sir you have not accepted our package when it was sent for delivery. Shocking. How can they start refund process If I have not accepted there item? Now i sent them the return slip photo that i have accepted by paying 15149 INR and returned the product. I got some mails from amazon on the same day that we have again started working on this and now we will sort out the same issue within next two days. I kept waiting till last thursday 20th of August 2015. I called again in care. Same sorry replies and same solution steps that we will do it sir. Now it is height. I called them yesterday 25th of August and asked to contact their floor manager. After keeping my call on hold for more than 30 mins someone talked to me and then he said sir you have not accepted the courier. Wow!!! I again told him the whole ramayan and mahabharat. Then he said sir actually the courier company has not updated your courier delivery status. What the hell!! Is this my fault? And they are telling me this thing after 20 days. I again asked him for solution. He said sir we will solve it as soon as possible. Still waiting for their reply. 15149 rs may be very small amount for amazon or any other online retailer but its very huge amount for a boy like me who takes pocket money from parents. I want to sue amazon over this issue and want my money back as soon as possible.