50 minutes after promised delivery time and **** milkshakes.

I placed my order via the Nandos app at 19h11, and the app said ETA on my order is 20h00 from Nando's Queenswood Corner. At 19h55 the store phoned to say there is a slight delay on my order as the driver is on his way back now, and will then bring my order once he is back, to which I said thank you for letting me know. But then at 20h40 I phoned the store to ask what the hold-up is. They then said the driver left at 20h00, but he has 8 orders to deliver. The driver arrived at 20h50, the food is cold, the milkshakes are watery. I phoned the store and spoke to the manager, Kabelo, who then said the milkshakes are fine and I quote "they are always thin and never thick, we don't use ice cream, it is made from syrup, ice, and powder". How can you even call that a milkshake? And how can you deliver cold food 50 minutes after the promised delivery time, then just give a meaningless "I'm sorry" and think I will just be happy now? The store manager, Kabelo, has no sense of customer service and feels I should not be unhappy with the delivery time because they only have one driver, as if I should be the one feeling sorry for them.