Amazon India — no response on replacement requests

My name is jay singh & i have purchased a mobile "redmi 4, black, 4 gb ram & 64 gb memory" from amazon which was delivered to me on 16 aug 2017. My order no was #[protected].

I have raised a replacement request on 17 aug 2017, which was accepted by their company & pick up was scheduled on 18 aug 2017 between 3:00 pm & 6:00 pm as per confirmatory email send by their company. But no one turned up to pick up the same.

Since then, i have spoken number of times to their company customer service executives (Ravi, hitesh, saurabh... To name a few) & requested for the replacement.

Pick up was rescheduled on three occasions ie. 21 aug 2017, 23 aug 2017 & 24 aug 2017 between 3:00 pm & 6:00 pm, but no one turned up ever.

I have a request for pick up of the product & its replacement after prolonged harrassment.