If you don't have a broker you can call, and you can't call anyone with the company you think you inevsted in, one place to start would be to look up pending litigation in Los Angeles Superior Court and in federal court under the party's name for a small fee, at the links below.
You may need to also contact the LA City Attorney to see if there's a criminal investigation pending. You may also want to hire a lawyer for help.
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.