Poor service from Steers Hillcrest Oxford Village

Poor service received from Steers Hillcrest Oxford Village tonight. It's a Wednesday night and they advertise their online combo deal including 2x Wacky Wednesdays plus 2x Large chips via the Steers mobile app. I opted for this deal and after adding some extras submitted the order at 17h48. Our first delivery came 52mins after the order was placed. He only delivered 2x Wacky Wednesday burgers. When we enquired about the chips, he because quite defensive and told us that he does not deal with the orders and only delivers. He told us he will go back and bring our chips. 20mins later our 2nd delivery came. This was another guy (much friendlier and apologetic), but the order was still wrong. This time they only delivered 1x Chips instead of 2. I asked him to go back to fetch the 2nd side if chips and a complimentary milkshake to compensate for all the inconvenience caused. It is now 20:46 and we are yet to receive our 3rd delivery. Living in a modern world in 2018 it should not be so difficult to read, understand and process a simple order placed online. With clear indication on which items were ordered, prepared and needs to be delivered. What kind of process is being followed to ensure the customer gets what he's paying for? Is this deliberate or just one of those things? I feel like I have been done injustice. I still do not have what I paid for, and have seen no remorse from Steers. This complaint will be made public in all social media platforms if no solution and apology is received within 24hours.