Delhivery — Courier not delivered after repeated follow up and returned back without any reason

One of my relative send one birthday gift ( garment) from kolkata thru Delhivery courier . We got SMS from courier company confirming the same and specifically informing to share OTP once delivery boy is at door step.

We got a call from delivery boy from outside and he asked for OTP . We refused to give OTP and ask him to come to door step to share OTP. But instead he refused to come and told us to cancel the same . We never agreed and he never turned up.

After that we tried to contact Delhivery courier customer service but not a single number is working, hence we booked a complaint in their website on 10th march, complaint reference number 34021954.

But after that also no response received and ultimately the parcel gone back to kolkata without delivery.