PnP ASAP! Worst Service

On Thursday 5 August I placed an order on Pick 'n Pay app ASAP! (previously known as Bottles) at 12H18. The delivery time stated they will deliver between 15H00 and 16H00. I waited patiently for my order to arrive, however at 15H00 I thought let me just check up on the order to view the progress of the delivery, and the delivery time changed to 19H00-20H00 - I decided I want to cancel the order and used their chat application with in the ASAP! app and placed an order on the Checkers app, as I couldn't wait until PnP deliver. I received my order from Checkers, but still waiting for a response from PnP, which I finally received at 20H02 telling me they can not cancel my order as the driver has already collected the order. However the driver got lost and I wasn't at home anymore, which I made clear in my chat message to ASAP! On Friday I requested again that I require the order to be cancelled. Eventually I send them a message with my work address and advised if they are unable to deliver at my work address before 17H00 that they cancel the order and refund me. Again no delivery happened. So Saturday came, and I receive a message advising me that they will be delivering between 30 and 45 min. I though no point in arguing to cancel the order, I'll just wait and accept the order. So 5 min after the estimated delivery I asked what is happening with the delivery due to the app showing that goods were delivered, but I have not received anything. Thereafter I send a message every hour without any response. So now it is Saturday 18H00, still no response, no delivery, can't get through to anybody on the phone lines - worst service ever!!!!