I wonder if the guys can get away with a cancellation fee too lol...
There are so many ways to avoid this situation that it shouldn't happen. With the exception of the client just flat out lying. As long as you contact their references then a provider should be able to weed out the lies fairly easy. If a client did lie to pass screening then all bets are off. If he didn't lie and passed them gets turned away at the door then that's on the provider for lack of thorough screening.
So I say a lady needs to use all the resources she has available to avoid turning someone away at the door. If a lady doesn't and continues to turn others away then she needs to be ready to accept what happens