Delhivery — No other way to contact delhivery

My waybill number is[protected].
Contact number for this package is not reachable for incoming or outgoing calls at the moment as I am outside india. Instead of going straight to the address where anyone from my family can receive it, they just try to call the number and skip the delivery if number is not reachable. What is the purpose of having an address then.
Even when I try to call the customer support from other number to give them further instructions on delivery or alternate number, the call gets disconnected saying " to make call from the number that is related to the package". How am i suppose to contact now? They should have some common channel to be contacted whatever the number may be.
On the other hand, cannot they just go to the address and deliver it? Proper address is mentioned there.