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You can report link schemes to Google here: https://support.google.com/webmasters/answer/93713?hl=en Here's Google's guidelines on link schemes: https://support.google.com/webmasters/answer/66356?hl=en&rd=1 It's unlikely that you'll hear back from Google. The best thing you can do is report it, and move on to creating quality content and natural backlinks for your client. Google eventually catches on to manipulations.