Our client has a competitor that has been rising in the ranks and has tons of fake reviews. You can tell because the people writing reviews are all well traveled all around the world writing reviews. =P
The best place to report fake reviews would be on social channels. Put together all your evidence in a Google Doc and then send it to Google My Business. You can tweet to them at @googlemybiz or message them on Facebook at Google My Business. Usually they respond in 1-5 business days.
New advertising option:
A review of your product or service posted by a Sterling Sky employee. This will also be shared on the Sterling Sky & LSF Twitter accounts, our Facebook group, LinkedIn, and both newsletters.