Shocking service from Pick 'n Pay asap!

On 26 Nov I placed an order on the PnP asap! app. Initally my delivery time was scheduled for 11:00-12:00. By 12:30 I hadn't received anything and checked the app for any updates. My delivery time had moved to 15:00-16:00 without any notice. By the time I left work (17:00) I still haven't received my order. Shortly after 17:00 I received a notification that the driver is on his way. Then at 18:08 I received a notification that my order has been delivered. There is no one at the office after 17:00 so I don't know how my order was delivered successfully. I have tried the customer care line multiple times with no answer and when I tried to leave a message the mailbox is full. This is absolutely terrible service from PnP and I want my full order refunded!!!