I'd personally never see a pimped girl, and I thought that was the general consensus here. I certainly wouldn't be arguing with her pimp for a refund. It's a gang for f*cks sake. You're dealing with a gang and expect fair treatment? No.
As has been mentioned, if it's a B&S, walk. At the very least talk to her, sort out what's on offer and then hand over the money. Those few moments should be enough for you to see if she's full of sh*t.