Hello, have trouble with Ford because of the rust guarantee. Although all inspections have been made, the Ka rusts. Now after the winter the underbody looks like it will soon crumble. Ford says that these are all stone hits, although the rust from the grooves and double plates swells. Has someone ever complained rust against Ford for something and a verdict that I could refer to? Or an expert opinion? Greetings from Paderborn El Treno