Application Order Delivery failure

My boyfriend and I ordered Nandos in the app on the delivery option order #8310/458336 . The app processed the order and we requested cash payment on delivery. Our delivery ETA was approximately 45 minutes after the Order was placed. The delivery time passed and the app had not updated for 30 minutes with a new ETA and we were worried that the driver was lost, that the branch never made the order, that no delivery was going to take place or that we would be billed for an order we never received. We then contacted the customer service number the app provided under the order *** over 13 times with no success. Options to track order ,to speak to the manager, other than the "place an order" number dropped the call. We then spoke several consults to the "place an order " extension and the call was dropped twice,the agent said they do not deal with complaints, I was told to select alternative extensions that automatically dropped the call and eventually I was transferred to the "complaints" line which did not answer after 10 minutes. We tried over 30 minutes to get in contact with the branch ,we researched the telephone number through the malls website and this *** number pops up a number that does not help customer get in contact with anyone who can assist what so ever.My boyfriend called on my behalf and tried a different angle with the "place an order" customer service agent by giving him the order number to check the progress as he informed the agent that the extension does not work to track the order. He then informed the agent that we still had not received the order that was supposed to be delivered an hour prior to the call. The agent communicated with the Nandos branch. The Branch Manager then called to speak to us and apologize (mitchells plain promenade) and advised that the order was despatched 10 minutes ago. The driver arrived and was friendly, and we explained our frustration and thanked him. However, throughout this whole process, the app did not update the ETA or neither has the order show that it was delivered. Please fix the issue as it is affecting the customer service experience and we do not trust to use the app again due to thus glitch.