Poor service

I am so upset, I ordered meat from the Pick n pay app yesterday and they brought me half of the price of the meat I ordered. I contacted the customer service on their chat service and Nobody got back to me. I called them today at 12:00 spoke to Caz Arendse who said he would send a driver to collect and exchange the meat. I heard nothing since then no notification by 15:00 and I have guest coming by 19:00, to which I needed this for the event tonight. I specifically asked for no refund to be processed when I called at after 15:00 I spoke to a lady first advised that a refund had been processed and that no delivery would take place, to which I asked to speak to a manager, then she placed me on hold and its after 4pm and have still not received a resolution for this. Why do they have the option of a delivery app when this is the second time that I received the goods I did not order. I have never received such horrible service in my life before