Medlife — poor service--delaying delivery

Medicine is always an emergency product. But it is taking so much time to deliver my ordered medicine to me.
I ordered for some medicines (Order no. OR9471HQA-001A) on 29th june 1.00 a. M. Which were expected to be reached to me in between 2nd Jul . But as i did not get the same within that time, i, myself, called the customer care at about 10 p. M. On 2nd July and then i got to know that some of my ordered items are not available, that's why they couldn't release the whole order for delivery. I like to ask that, should it not their responsibility to intimate me earlier about the unavailability...