Do you have access to the provider's only board? I would recommend coming over there, myself or another one of the ladies may have some suggestions for things you can do to minimize your frustrations.  

We've all dealt with people making contact with the sole intention of wasting valuable time. When it happens all at once, it can seem discouraging and overwhelming. I would encourage you, however, to not let the actions of a few bad seeds taint your perceptions of the gentlemen here as a whole. There are many lovely and honorable clients in this city, I hope you've had the opportunity to meet some of them. Of course, you're free to do whatever you like in terms of booking requirements, but I'd be happy to offer some feedback on what has worked for myself or other ladies in the past if you're interested.

I hope this week is better!
xx

How are you going to collect? And I know full well the annoyance and frustration of waiting for someone who never shows, nor bothers to cancel. Stil doesn't mean you're going to get money, and you may well turn people off who might have been good clients