If your account was banned by Blizzard unreasonably and Blizzard failed to resolve the issue with you, below are some additional resources to move the issue a bit further. Hopefully with enough complaints, officials launch a formal investigation...
Following are additional resources recommended by the CA AG
“We also suggest you contact the Internet Crime Complaint Center (IC3) which is a partnership between the Federal Bureau of Investigation (FBI), the National White Collar Crime Center (NW3C), and the Bureau of Justice Assistance (BJA). The FBI's IC3 Unit is organized to handle internet business fraud. You may contact them at http://www.ic3.gov.”
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Better Business Bureau
https://www.bbb.org/consumer-complaints/file-a-complaint/get-started
Federal Trade Commission
https://www.ftccomplaintassistant.gov/#crnt&panel1-6
California Department of Justice
Office of the Attorney General
http://ag.ca.gov/contact/complaint_form.php?cmplt=CL
Following are additional resources recommended by the CA AG
“We also suggest you contact the Internet Crime Complaint Center (IC3) which is a partnership between the Federal Bureau of Investigation (FBI), the National White Collar Crime Center (NW3C), and the Bureau of Justice Assistance (BJA). The FBI's IC3 Unit is organized to handle internet business fraud. You may contact them at http://www.ic3.gov.”