What's the most effective way to report PBN? - most effective skin care products 2014

Hi, I 've found some PBN sites that link to competitors (dozens of them all look the same ).
I read in some articles that the report web spam page is not working very well --
What ideas/experiences do you have about it and how can I report these sites effectively?
Also, the same competitor seems to have purchased fake map reviews (most of them are not good in English, and some of them don't make much sense to the products they sell )-
What is the best way to report these comments (even his entire gmb page? Thanks.