Short Delivery with No explanation

For the first time ever this week i decided to make use of the PNP online shopping system to assist me with something i was doing for relatives. I order approximately R967 worth of goods including delivery from the site, certain things i wanted to buy said on the web page not available or out of stock which i completely understand and accept no issues. However what i do take great exception to and irritates me to no end is when things that were available and ordered just simply do not get delivered with no excuse nor explanation... If i would have wanted to order R814 worth of goods i would have only selected that amount but i didnt, i ordered what i needed and expected to receive. I was not even given the courtesy of a call to explain to me it wouldnt arrive and give me the option of purchasing an alternative. When you are paying for a service you should get what you wanted so this was not a great first impression unfortunately for a service i had hoped would be something i would make regular use of...