Amazon India — product not delivered..!! customer care are useless

Address:

560048

I ordered samsung mobile on 25th july 2018 and i was informed it will be delivered on next day i. E. 26th july. I paid rs 100 extra for next day delivery. But it wasn't delivered yet. I called customer care twice they told it will be delivered on 27th july morning 8.0 am. But status updated that my mobile is not reachable. If it's not reachable then why they have not shared delivery person contact details with me. Since they couldn't deliver on time some excuses they will put as reason. This is really frustrating and disgusting. But unfortunately still i haven't received any delivery no response from amazon.