It is not unusual for a staffing company to massage your resume a little. I have ran into one that completely rewrote my resume which made me very uncomfortable. It wasn't wrong, just very misleading. So when I went on my first interview with this staffing company, I brought a copy of my resume the way I wrote it. The hiring company was aware that the staffing company massages resumes.
Frankly, I don't see a cause of action. And even if there were, what kind of damages would be due when there was no guarratee of a job?
I suggest you just stop working with this staffing company.

