Delhivery — Shipment not received but marked as delivered

I did not receive my shipment but it is marked as delivered AWB [protected] . I was not available at the moment so told the agent to come back later. And then the package was marked as delivered. When contacted the agent he told that the package was left under the steps in my apartment. But it was not there.

I raised a complaint in Delhivery and was told that I'll get the proof of delivery. What use is the proof of delivery when package was not delivered at all?

The Delhivery doesn't have a phone support and they're not replying on the e-mail either.

Kindly help me with this and deliver the parcel ASAP