Amazon India — complaint about not delivering the product and updating it as delivered

Address:

Bangalore, Karnataka, 560084

I had ordered for two pieces of morphy richards food processor on 13/10/2018, but i have just received only one piece from amazon, and they have uploaded as only both the pieces are delivered. When i had called amazon on[protected], i was told my parcel will be delivered in another 2days, but i didn't received the product for another 15 days, then when i had called amazon customer care regarding this, they told that they will investigate in this matter and according to there investigation report they have delivered the product, when i asked about there investigation they told that it's there internal matter and will not give a report about it. I dono what to do next please help me.