whats the best way/is there a good way to cancel an appointment once the girl has arrived and she's either not the same girl in the add or claims that the $250 was just for a sensual massage and the it's actually $500 for FS.

In the past, I've just given them $50 to go away and cover the cab/parking, but even this seems unfair to us.

You tell her "I am sorry you are not the girl I scheduled with or I am sorry that is not the price I was quoted" and you send them on their way.

It is not up to you to give them any money for cab fare or a consolation prize. They knew walking into that room they were either misrepresentng themselves or they were going to upsell. They deserve nothng.

When I was in the business I had a gentleman that was unhappy that I wore glasses.....it totally turned him off. I excused myself, apologized for the misrepresentation (I wore my contact in my phototgraphs) and I went home. I never once expected anything from him because I was not what he expected.

My advice, don' be rude and nasty, but don't be a pushover and give them what they dont deserve.

very good advise, Mistress

No you do not have to give $50(or any other amount)
Politely just ask her to leave.
If she puts up a “hissy fit” for cab fair,valet or any type of money,
Calmly say – Well,if you like I can call security and they can escort you down ………...... Oh yeah that will make them go away

To that I say "Here, here!" All good advice ladies.