Disgraceful Customer Service from Defy

My R9000 fridge freezer failed after 3 years (almost to the day). It had hardly been used as t was in my holiday home. They dispatched a "technician" at a cost of R454. After a cursory inspection he concluded that it was an internal failure which could not be repaired. He was unable or unwilling to explain his diagnosis without even opening the unit. I have attempted to get a response from Defy but they have not responded. An "internal failure" can only be a manufacturing defect.