Let's assume a hypothetical context where someone figures out that a given businessperson's claims to have a PhD from a prestigious university are not true. The person in question was enrolled in a PhD program but they never finished and therefore no degree was awarded. The person is introduced in interviews and presentations as "Dr." and listed in the company's website as having a PhD in a scientific topic from a specific real university.
Provided the evidence is unequivocal, the questions are:
What is the ethical response to this? How to handle it?
Is it fraud?
What are the mechanisms available to denounce this, if pertinent?
(depending on answer to previous question)
I'm personally interested in the case for Europe and UK, but cases for other countries may be of general interest.
This is related to other question about Diploma mills, but my question is about real prestigious universities, real enrolment but no award.