One Cart shows no courtesy to their customers

I ordered goods yesterday for delivery this afternoon. In other words One Cart had more than ample time to start processing my order. I waited and waited this afternoon and at ten to six, ten minutes before the latest advertised delivery time I get a message on my app to 'get excited' as my shopper had started shopping. Well it will take a lot more than ten minutes to shop, process everything, pack it and drive it three kilometres to my door. I contacted the shopper via WhatsApp and told her to cancel as I could wait no longer, as believe it or not, I actually do have a life that extends beyond waiting for grocery deliveries. The shopper then phoned and the excuse given was that they had been 'very busy'. I don't care how busy they were, it is plain common courtesy to notify customers if you are going to be late. A simple WhatsApp message or something on the App would have sufficed. So no groceries, an app showing the order delivered and no refund in my wallet. Now I have to find money from elsewhere to put a decent meal on the table on Easter Sunday, a very important feast day in my religion. One Cart is overpriced and has poor service delivery