I am not the expert. I am just a user like you. I have a similar issue, did some research, and copy&pasted this quote from Booking.com hoping to help others. I am in the hotel business. I decided not to report the guest misconduct because I have learned several things ... among them - people are far more motivated to post bad than good, - paying attention to a bad guest such as responding to a bad review is just what they wanted so I ignore most bad reviews, and - Google has told me on a recorded line, that they "are not concerned with the truthfulness of reviews" when I offered to prove that a person threatened a bad review if not given a free room.
To submit a misconduct report: