Can an Independent Contractor file a lawsuit for discrimination at the place he was working.?

I recently started working for a company who hires professionals to work as independent contractors, basically the only thing they do is they will withold taxes from your wages. I worked for about three months with this company, the three months was hell, everytime my supervisor will come and say this person said thisor that, but I can't tell you who said this or that. But I am investigating and I will get back to you. This went on constantly for a period, then they call me one morning and said they were giving me 90 days notice for termination, so I have to promise that I will stay for 90 days or just leave that same day. I decided that I won't be able to guarantee that I will stay for 90 days so I left. I feel I was discriminated against me for National origin or race. What can I do?