DTDC Courier & Cargo — Delivery executive refused to deliver at doorstep with zero human contact

I was sent a parcel by my mother from Kolkata to Bangalore. My mother was promised safe and secured doorstep delivery with no human contact, the same is written in the acknowledgement receipt as well. When the delivery executive came to deliver he refused to come to the doorstep citing a direct order from DTDC apparently to not deliver at the doorstep. I was busy at the time on an office call and that too on the 7th floor, I couldn't come down to collect the parcel. I requested him multiple times and even mentioned what was told to my mother at the time of sending the parcel. He still refused to deliver to the doorstep and left without delivering the parcel. I talked to DTDC customer care, there is no mandate from their side refusing doorstep delivery. My apartment is following all guidelines of no contact delivery so there is absolutely no reason for the executive to refuse doorstep delivery. Please take some action against such kind of delivery executives and please deliver my parcel asap.