Amazon India — Product not received but according to delivery boy delivered

I have mailed amazon on my 2 safe ordered and show delivered but was not delivered to me.
The moment i had recvd msg saying product delivered i called them and said that i havnt recvd anything but they were like dont panic u will recv your product within next 4 working days or we will refund you.
But aftr 4 days when i complaint again they registered my complaint and said they will investigate the matter and revert within next 4-5 days.
Aftr 4-5 days when i didnt recv any revert i called to check and then they saying tht the product has been delivered to me and to check at my place and with neighbour. If i had recevid the product myself why will i file a complaint of not receving and the delivery boy has his own theory that he has kept the product in my lobby area of the building and informed me upstair abt the product which is a lie. I feel its all under the same scanner of scam. They are scamming customer with fraud.