Dissatisfied customer

I am very dissatisfied for the type of service i received when i needed it the most. My baby of 4 months ran out and my toddler of 15 months needed his skimmed milk that i ordered. Order was placed after 2pm before 3pm then i received confirmation my order was placed successfully and delivery will be between 4pm - 4.30pm. I then received a notification to say my order will be delayed and that's okay as my baby still had 1 feed left. After before 6 came and im still waiting i then called the callcentre and the consultant whos name i will not mention confirmed by order was cancelled why i do not know as my baby needed the formula. She then promised to check, call the store and get back to me of which i am still waiting. I called 30 mins after now having to purchase more airtime and the consultant explained a whole story about a technical error on the app after i told him my story and my call got cut, i wouldve expected a callback as im sure he couldve seen the notes left on his side but nothing. I call again a few minutes later almost 7pm and spoke to another consultant,explained everything and at that point i was more livid because im finding out that the driver cancelled my order due to my area being "a danger zone" bare in mind it's not the 1st time im doing online shopping with pnp and i never received this kind of service like i said at a time where i needed it the most. I normally do checkers 60/60 but because i am 5 mins drive away from a PNP i thought i just would've been quicker but then it costed me more now as my infant was sitting without her formula. Also the fact that my order was canceled by the driver was not the issue because if there had to be some sort of communication i then couldve made another plan. A cancelation email came through at 20h55pm.