Okay I have to vent here not necessarily about having them but the transparency of them. And especially since I see this provider on the discussion board now acting all sweet. We can call her Dj AM. So first let's state their policy: Regrettably, more than once requires either a 50% donation of the canceled date or severing of our acquaintance.  
Very fair policy and after that you should be compensated for you time: it's a business and that is understood. Have no issues with it. So prior to my very first appointment, I broke my ankle the night before. Went to the hospital and I even immediately contacted to cancel my appointment with her assistant. She was pleasant and very nice and said everything was okay. So three months later I try to set up another appointment since she was traveling prior to making Chicago permmenant residence. I was told because I cancelled that I had to pay the 50% and that it would be used for the session whenever I booked but until I give it can't set anything up. So I paid it. She then went out of town. Came back and I tried booking. And I got an appointment. I asked if my cancellation would then go towards this one. And her assistant said no. I asked why and she said because i booked after 30 days of paying it. I stated no where in any email did you say that and no where does it say you have 30 days especially since DJ AM loves traveling which makes it hard to book.  
Don't mind cancellation ladies you should have them. I mind straight up shadiness. Poor reflection of other hard working people.  
Now let the bashing of me start.

That was extremely wrong, especially since they required you to pay it before booking your next session, but then did not fulfill the session. I would be upset too. Charge it to the game and visit another provider. This one seems to not want to book with you or just wants more money. The headache isn't worth it.

Thanks for calling me a flake. Really sweet of you. If you read the post it stated that she was out of town. As far as calling me a liar I did show proof but thanks for all ready passing judgment. Besides this are you also a medical professional maybe I have seen you around one of the hospitals i see patients at? FYI you don't stay over night in a hospital bed for a broken bone ever unless there is a puncture in a vital organ and then there would be immediate surgery done. Also FYI you would not stay over night either for tearing your Achilles heal either. They would put you in a temporary cast until you can see an Orthopaedic.  I have no issues with cancellations but that is not what the policy stated at all.  
Also please provide me with one smart phone that time stamps their pictures nowadays. Looking forward to seeing you on the floors of the hospital Dr Mya.

That's one thing I absolutely love about these boards, it reveals to us guys the women we should avoid.

BTW he clearly said SHE went out of town, not him. Before calling a customer in your local area a liar, you really should actually read what he wrote.

Lastly to the OP, I think you should name names. I too can appreciate a plainly stated cancellation policy as no shows and last minute cancellations do cost the girls money. The fact that hookers are at least as flaky as the johns is a separate matter of course, but I completely agree that just pulling new rules and policies out of her ass AFTER collecting the cancellation fee is way past shady, I say "out the bitch"

If the provider in question is already potentially 'shady' wouldn't the OP have worries that she holds his verification information, name, employment information.  
It sucks that this happened but maybe it's a blessing to move on and you'll eventually hook up with someone who values your business.

It does raise the issue of providing that kind of leverage to a hooker who may want to use it against you someday in the first place.

After a few of her posts here, can you imagine a guy with a lot to lose turning over the power to ruin his life to someone with the attitude of Mya? Note, she is highly reviewed, completely legitimate escort, but after reading a few of her posts of late, I have no doubt she would do what she thought she "had to do" in the event of a dispute with a john. If I had anything to lose, posts like hers would convince me to NEVER give out my info to a hooker, now matter how credible or well reviewed.

Well said GaGambler, totally agree!!
Let's not forget what this is after all, prostitutes like Mya deserve zero respect...