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:
I'm no expert, but I have this ability when adding extra person changes in Expedia through SiteMinder. But when I go to SiteMinder to add extra person charges to Booking, the same options are not available as they are with Expedia. I have actually had this discussion with a very knowledgeable support agent at SiteMinder earlier today. I believe that extra person charges must be added at Booking and cannot be added at SiteMinder. - At Booking, go to Rates and Availability > Calendar > (Rate Type - for me, Best Available Rate) - When the menu comes down there is a place to make adjustments (Edit Occupancy Pricing). Respectfully, Mark 12/11/18