Half an Order Ready, Sorry, the Printer is the Problem

We placed a lunch order at Grayston JHB RocoMamas on Friday 7 October. When we collected the order we were assured they only needed a minute more prepare our meals. The lady then gave me the wrong invoice but made me pay the correct amount. They were busy grilling burgers at this point. We come back 10 minutes later to collect our order. Everything is ready. When we check 2 smash burgers and all the chips orders had not been prepared and we had to stand and wait for that to be delivered. In a time where jobs are scarce and businesses are struggling, I cannot understand why staff do not take their work seriously.