My parents bought my brother a 2005 Peugoet 107 in September 2016. The car developed a fault (horn sounding with no one pressing it) and was sent to the local mechanic to get it sorted. When he was fixing the horn he noticed that the front crumple zones and slam plate had been bent in an accident and had corrosion on them. We have contacted the dealership regarding the issue but they have said if the car passes an independent MOT no refund will be issued. Our mechanic says the damage won't be seen as the car will not be stripped for an MOT and it will pass. Where do we stand?