PnP App inconvenience

I placed an order on the 26th of Nov at around 9am and my order was delivered at 18h30, upon opening my delivery, I realise that some items were missing which is so disappointing after having to wait so long for my order to be delivered, i then check and see that I was supposed to get 5 bags in which I only got 4, the following day I tried calling their ASAP support centre which never answers the phone, i then sent an email at 08h19 on the 27th of November and I still haven’t gotten a response from them after they advised they were investigating the matter with the store, for an app like this, communication should be easy but not with the PnP ASAP app, you can’t even track where the driver is or chat with someone from the store about your order, the only you have is calling and sending an email which never gets attended on time. I want my refund please.