Amazon India — without delivering the product, delivery guy marked it as delivered!

Address:

560067

I ordered pampers monthly pack on 15th July 2019, on 17th July the delivery guy entered my society but without delivering he left, i got the message on my mobile, when i called him he said it is delivered, i said no. Then called customer service the lady called payal denied to lodge a complaint.my concern is without giving the product how can you mark it as delivered!! If it's a mistake I don't buy it.please do something on delivery service.