Order delivery failure.

Very much disappointed with the service I received from KFC diepkloof square and their customer care agents, I made an order on their app on Friday the 26th of Nov at 19-20, after getting confirmation that the order was successfully placed,I kept track on the app, then around 20-30 after I still haven't received my order, I then called their customer care, then to my surprise I was told that the order was cancelled as there wasn't any drivers available to make deliveries, I then asked why wasn't I informed so that I can make collection arrangements, was then informed that the store was supposed to contact me 15 mins when they saw that the order was not delivered, I then asked to be transferred to the store so that I can speak to the manager, was then kept on hold and they cut the call, then on Monday the 29th I then called them again and spoke to a lady called Lindiwe and was told that I will be receiving my refund within 2 to 4 days together with a 50rands apology voucher, but up until today I haven't received anything whatsoever, I then decided to call again and was told that the case has been escalated to their finance department. To say that I'm disappointed will be an understatement.