Studio B Ripped me of as did with other shoppers Orlando, Florida

Purchased a zoom lens for camera on Jan 3, 2013.  Did not have camera with me at the time.  Was told it would fit.
Also told if it did not fit, I was able to return for refund.  3 witnesses with me.
Took and tried on camera.  Did not work. 
Returned following day to be told -No refund or exchange or return policy.  Same man said that I had brought in my camera and tried it on and it worked.
Total lie.
Will be posting notice in location where I stay, advising of this incident and no one shoud trust them.