Ecom Express — Regarding service

I ordered medicines from tata 1mg. They send the medicine through Ecom express. I'm not available on 1st day when the delivery boy bring the order. My mobile also switched off at that time. Next day I got a message from Ecom express. I contacted the delivery boy regarding the delivery. But he told me to come and collect at courier office. From then he never called me. But I'm getting messages like the delivery was attempted. But I'm not available.
What is the use of this type of delivery boy?