How can you prove (1) whether or not he or she is a customer of the business, and (2) whether or not he or she is using two different IDs for the same person?
The problem is, you cannot prove that it's not just one person, or that it's not based on a real consumer experience.
Maybe someone else will see something that I'm not seeing and give you better advice; from what I can see, though, the best way to address this would be to encourage the posting of many new, favorable reviews by authentic customers, with words, not just review stars.
@Tim Colling I agree, the best defense is a good offense, and they are trying. Unfortunately, this is one of the types of businesses where it's hard to get public reviews -- a high-end residential mental health treatment facility.
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.