Amazon India — Order is not getting pickup and refund is not issued

I have ordered the drone from amazon and it delivers the next day as I'm a prime member, but then when I don't like the product I return this to amazon first they told me that they will pick up my order on 1st May but didn't come at my pickup place and I got a message that delivery is canceled by the customer that I didn't do that and after that u again place return request they gave me the date of 12th of may again that day the same thing happened that delivery boy cancels the order and I got a notification that cancels by customer.
After that, I again place the return order and they give me the date of 16th they didn't come for pick up after lots of calls to the delivery boy they came and pick up my order and till now I didn't get my refund back.