Mr D food refunds a poor customer experience

My review is with regards to the Customer experience on the Mr D food app. I ordered food yesterday and made an EFT payment on the app. They took the money only to return a message saying the restaurant I ordered from is out of stock for my particular order. They now tell me that it will take 5 days to refund me. My question is, why take my money in real-time without checking with the restaurant and only refund me after 5 days? This is a **** experience and I will no longer use the app.