Take ages, never calls back, too busy for client attention

sorry there is no option for zero stars. We handed in our DeLonghi coffee machine for repair on 9 May 2019. Got it back, still not working, took it back, Still waiting for repair and it is now almost a month. They are always extremely busy, never calls back, technician often away, day off, just nowhere to be found. They are supposed to be the authorized repair centre for DeLonghi in Cape Town, but I wonder if DeLonghi International is aware of their shoddy, service. If they are so busy that they cannot attend to phone calls or take weeks or months to fix appliances, there is something wrong with their business model, or they should appoint more people.