bad service and there product is bad so disappointed in them

I am so disappointed in Samsung i have upgraded a galaxy note 9 from vodacom in January since i received the phone it was ok at first for a months. then after the second months the battery dies fast if i charge the phone like in the morning not even after a hour or so the battery drops to 30% power i went to samsung repair center to ask for there service there service was not good at all！ i have the same issue with the samsung A7