No order received and No comms with PnP

I placed an order at 07H48 on a Friday and the delivery time was set for 10H00-11H00. The delivery time then started going up until it reached 17H00 when they said that the delivery man was on his way. In the interim I called their call centre various times to get an explanation as to what is happening top my order. Around 17H30 they informed me that they couldn't get a hold of me despite the fact that no call was made to my cell nor was there any call from the security. 24hours have now passed as the app states that they have "SUCCESSFULLY" delivered my order and that there is nothing on my cart. I spent hours trying to get a hold of their call centre to no avail. This is undoubtedly the worse service I've received from an entity like PnP!