Amazon India — Product is not delivered but status is showing delivered

The product ordered from Nobero and shipped through Amazon is not delivered on the scheduled time, but in delivery status is shown as delivered.
No reply in spite of raising tickets/ complaints. Also, I have not received any call from representative regarding this issue.
At the time of delivery, the agent has to ask OTP or PIN for delivery. Its such a great shame on these companies not meeting customer requirements.
I suggest that better to avoid these people and think thrice before placing order with them.