good news, there is an official report form.
If you find a review on your Business Profile that violates Google policies, you can report it for removal. This helps keep Maps and Search safe and reliable for everyone. Report inappropriate reviews
support.google.com
Google has a very specific terms of service and if you can prove somewhere in the review a term was violated, I've had success with getting them removed. Some of them are pretty straightforward and not hard to point out
-spam content
-personal contact information
-URLs and phone numbers
-rambling that seems to have nothing to do with the service
I've found the above four, easiest to prove and get a review wiped off. Another tip, I usually wait a couple months to do this. Some of the severely personality disordered individuals will stalk your profile and if they see it got removed, they make another account and try something else.
My VOIP also has a call blocking system. It does not allow calls from people who *67 and I can enter individual numbers to block. It's also great for blocking spam callers. And what they hear when they call, sounds very convincing. It's 5 fake ring tones and a "sorry, this voicemail box is full, thank you for calling."