I believe in America the corporation is given the edge. “We didn’t say you’d get 400ml of coke, we said a medium was 400ml.” Is a legally viable argument. Its only false advertising if taking the statement at face value is provably false, a la “Red Bull gives you wings” was changed to “Red bull gives you wiiiings” because the original was provably false, and the second one can be defended as “wiiiings isn’t a real word so it doesn’t mean anything”