Terrible customer service regarding on-line shopping

I sent the below message to the Mr Price customer service platform. Good morning. I placed an order online on Sunday for 2 items to be delivered to my local mrp. I opted for the express delivery and paid R35 extra for this. According to the information provided for this type of order, delivery time was supposed to be yesterday by 5pm. I followed up on the order on Tuesday and was informed that the order had not even been placed as yet. The call centre agent then placed the order and assured me that the order would be delivered on time. I was at the mrp store yesterday, i.e. Mr Price Pavillion, and no order was received. I then contacted the call centre again and was then informed that the order was somewhere between the warehouse and the courier, and at this point in time they had no idea when the order will be delivered. I asked for the courier's contact details and was informed that they could not supply me with these details. I am leaving on a red eye flight tomorrow to Cape Town and had placed this order to take with me on my trip. I am horrified at the blatant disregard for the company's promises to customers when we order online and the unwillingness to correct the problem. At this point in time I require assistance with this as today is the last day for me to receive my order. Failing which I will seek to resolve this online through hellopeter or another customer service platform on social media. Following this, I contacted customer care again and was informed that the order had not even been shipped as of this morning and the delivery day is actually next week Monday. I am not a big client with millions to spend, I am the little guy that Mr Price built their business upon and yet this is the treatment that we are given? Very disappointed, I will NEVER purchase at Mr Price again, be it instore or online.