Amazon India — Late delivery : saturday 13 may 2017 /[protected]

Address:

Pune, Maharashtra, 411057

I have ordered Apple iPhone SE (Rose Gold, 64GB) from Amazon.in I have subscribed a prime delivery to get order faster and my expected guaranteed delivery date was 15th May, 2017.
But it was not been delivered yet, Today's date is 17-May, and still showing

"The courier was unable to contact the recipient to arrange delivery. Please contact Amazon.
PUNE, IN".

I have contacted many times to customer care via chat/phone number still not getting the solution and exact root cause why this late and my expected delivery date was changed to 15th May, 2017 to 16th May, 2017. It was strange customer service manager is saying you can cancel your order. It was totally wasting our time. It's been more than 4 days.