Disappointed in Pick 'n Pay's online shopping

On the Tuesday 21st July I placed a shopping order online, I has accidentally put in the incorrect time which I realised I would not be there at that time due to looking after a friends place. I then called straight away because for some reason even though I went back into my order to change the delivery time it was not allowing me to check out with that option to change it. So I called pick 'n pay helpline, the lady tried to take me through the same thing I tried doing twice already when she couldn't understand what was going on. I then asked her if there's any possible way it could be changed manually. So she whilst i was on the phone emailed the store to ask them to change the delivery time from 7-8pm to 5-6pm. I then received an sms on the 23rd stating that my order would be delivered between 7-8pm. I called them again to explain that I won't be there and that apparently someone has advised the store of the time change. The lady on the other end confirmed that and that it would be delivered between 5-6. I left the house at 615pm and they had still not arrived.... I received a call at 19h35 to say they have delivered. Terrible service & still have not received a call