No, but it's like ebay, you leave a WG a negative review she'll leave you one. You get a few negatives yourself and then some other WG's won't see you.
Imagine you say she was a crap punt, charged extra for everything etc. She replies you stole off her, never showed up, smelled of booze etc. Other WG's are just going to avoid you if you've got a few reports like that.