Very poor service at Debonairs

So I placed an order for delivery with Debonairs pizza Jabulani Mall via the app on the 1st of February, order confirmation received at 16:28, waited for my order for an hour then called the restaurant a number of times to enquire but my calls weren't answered. Delivery man eventually arrived at 18:10 but with the wrong order so he left to go get the correct order. I waited, tried to call the restaurant again but my calls still weren't answered, I eventually called the call centre and spoke to a nice lady who took my details and promised to call the restaurant and also said she'd log a complaint on my behalf and that I will receive a response from Debonairs in 24 to 48 hours. I received an SMS with a case number the following day but have not received any further communication from Debonairs. The delivery man eventually delivered my pizza at 20h00. There is so much that is wrong with this incident, 1) my order was late, 2) non of my calls to the restaurant were answered, 3) the delivery man came with the wrong order, 3) delivery man came back with the correct order at 20h00 for an order placed at 16h28, 4) it's way past 48 hours since my complaint was logged but I've had no response from Debonairs with the exception of sms with my case number.