Hired under the assumption that I was going to get pay hourly + commission...now they say no commission!?

I been working with a staffing company for 2 months now. When I took the position I was told I was going to get pay my hourly salary + commission for the sales that we made. Today when I call the staffing company and inquire about what has happen to my commission I was told that the cruise line that I'm currently working is not going to pay me any commission for my work. I took the position because I was under the assumption that I was going to get pay hourly+ commission...Is there anything I can do ? I feel I have been used and hired under false pretense. Thanks for all the responses in advance :)