Mugg and bean app

I downloaded the Mugg and bean app and on the app I quilified for a free hot beverage only to find when I got to the restaurant that the app is not functional which to me appears as false advertising. I asked for the manager to sort it out and he explained that its a head office problem and have launched numerous complaints as customer service is impaired. Fortunately after a long conversation about customer service I was sorted out. I was not happy about the service.