I don't have any recent examples, but we note that people do not have the feeling that the system is watertight, particularly in cases where people communicate verbally. Even if they did not call the company directly, in light of the fact that they know it is a structure put in place by the company, people will obviously be very wary. In any case, it will not be effective.
You need to put in place a truly watertight system so that people feel entirely confident. Otherwise, you are wasting your time.