Amazon India — Delivered empty box when ordered mobile phone

Address:	560103
Website:	Www.amazon.in

I have ordered one mobile phone from amazon india on 30th march which was delivered on 1st April. When i opened the box there was no mobile inside the box.
When talking to customer support they said we are not sure why this happend and hung up the phone on my face.
The details of delivery boy which i got through message was different from the person who came to deliver the box.