Myntra.com — Product not delivered but shown as delivered

Ordered fossil watch ES4113 from myntra. Product is not received but shown as delivered . Payment made in full and the delivery is a prepaid. Made complaint with myntra about the non delivery but they have closed the tickets citing the product was delivered in a sealed and pristine condition as per their investigation and hence the claim stands declined.
For the prepaid delivery without pin authentication how is the product was delivered.