Powersteering failure

My Nissan Levina suddenly gave powersteering failure. Only 36000 km and just outside warrenty. So still brandnew... Took car to Nissan service centre Kuilsrivier. Could not identify the problem twice using there equipment. When leaving premises it gave failure again and I turned back to show them. Then all of sudden it is the pump that needs to be replaced which is R20 000 can you believe it. Cant understand that a car with that low kilos need this kind of work but they could not identify anything at first. This useless visit to nissan cost me another R700. I am really unhappy about this issue and wish I never bought the car. If car with that low kilos is giving this problems it is either factory problem or just BAD quality car...