Very poor customer service & No accountability

I am very concerned at the level of service you offer your clients. I downloaded the sixty60 app and placed my 1st order today at 2pm. I nominated a delivery time slot of 4-5pm. I only received my groceries at 7pm. When I called the Cornubia branch I was told, "Sorry sir we can't help you, you will need to call the sixty60 call centre", I called the call centre and spoke to Connie, she told me that my order has left the store but could advise me on what time it left. She promised to call me back after 10 mins and I am still waiting for that callback. No one wants to take accountability and this is so sad, what a bad experience on my 1st purchase. When the driver gets to my premises he does not apologise for being late and his excuse is that he has too many deliveries. My question to is, Where is the sisty60 service? You deliver my order 2 hours later.