Its nice to see that Google put together this information on choosing an SEO. While it sounds a bit scary when it comes to making a choice, just be sure to do your homework and give a call some of their clients. Here is a link to additional tips.
Here is information on where to report a fraudulent SEO company:
The Federal Trade Commission (FTC) handles complaints about deceptive or unfair business practices. To file a complaint, visit: https://www.ftc.gov/ and click on “File a Complaint Online,” call 1-877-FTC-HELP, or write to:
Federal Trade Commission
Washington, D.C. 20580