Here is the form, very simple to fill out:
http://oag.ca.gov/contact/consumer-complaint-against-business-or-company
And from what I've heard, they are quite capable of getting you something compensated.
Just fill out coinbase.com for the company or maybe fill out San Francisco for city. Coinbase obviously doesn't supply an address or contact info.
For bitcoin to be healthy, companies like coinbase.com needs to be weeded out.
I filled out the form, and got a form letter in the mail. Not holding my breath on them to help me out.
And what sort of company is located in San Francisco, yet has a mailing address in Oregon? It just screams "scam."
http://coinbasefraud.com