Ecom Express — Package delivered wrongly.

My package docket no.[protected] from amazon was to be delivered on below mentioned address:
Pooja c/o wipro enterprises ltd., plot no.77 epip, phase 1, jharmajri, teh nalagarh, baddi.
It was not delivered to me and the status was updated as delivered (09/07/2016).
On enquiry the customer care gave the number of local contact [protected], who further gave the number of delivery boy [protected]. the delivery boy said that he had delivered the package at security gate of wipro but no package was recoverd from there. not a single call was made to the person to whom the package was to be delivered. i dont know what kind of delivery statergy it is? secondly if i have to make all the calls to track the package then what is customer care for?
I want to know who is responsible for the loss of my package. i will file a complaint in cosumer court for this poor service also mark the same to amazon.