My question involves independent contractors in the state of: California

Hi am a sales rep that just got stopped getting paid in the last few months for residuals on the accounts sold, I do not have my agreement executed from the company I represented, (I only have mine). I got paid for the past 4 years.

What can I do? Can I denounce them in the labor board? Sew them? they just stopped returning my emails or calls.

Thank you