Amazon India — Product and bill missing

Address:	Gautam Buddh Nagar, Uttar Pradesh, 201301
Website:	www.amazon.in

I had ordered 2 philips earphones from amazon website on 1st july 2017 and product delivery date is 7 july 2017 in office address. As per amazon policy according to customer care it will delivered 2 days before from delivery date. And i received the message from courier dept that your product will be delivered on 5 july 2017 and this message give the agent contact number but this number is invalid number. And at 8:00 pm, i have received message that you are not available in your office, so "product delivered failed". And i was complaint 8-10 times in a amazon customer care. And i received my product in 12 july 2017 after several complaints. After open the packet 1 ear phone is missing and bill is also missing. I dont know who is responsible for this for cheating.