Why do couriers make promises they cannot keep?

I have been waiting for the delivery of my book parcel the whole day after I had been informed that it was out for delivery. It contains text books from Amazon that I need urgently. When nothing had been delivered by 14:00, I WhatsApped Aramex for the approximate delivery time. They rep**** that I should have it by COD, which, of course, meant that one could not move, having to wait all day. By 17:00, however, there was still nothing. I checked on the online tracking app and to my dismay saw that it stated that delivery failed because the customer was not available. I then phoned them, telling the agent that nobody had attempted any delivery, and that I had been waiting at home specifically for that reason. She told me that the driver had actually run out of time and would deliver the next day. I asked why a misleading reason was given on the app, which she could not answer. To my further disappointment, I received an email from Amazon informing me that Aramex attempted delivery but that I was not home - obviously believing the courier whom they trust to deliver their goods. This is not good enough, Aramex - if you cannot deliver, own up. Do not mislead your client, Amazon, and the person who is awaiting your delivery!