walked up to a provider's door, had her answer the door and then turned and walked away for whatever reason?  Or gone inside and decided that it just wasn't going to happen and left?  Did you compensate her anything for her time?
Just wondering...

pain in the ass, just say what it is you mean to ask.
To answer your question, yes. I have walked away when I saw that the girls was clearly not the one in the pictures.

One other time I was already in the room before I realized this was not going to be working out as she laid down all her rules and gave me a shit ton of attitude. At that point I told her we were both wasting each other's time and gave her a 50 as I walked out. I will also say that this happened after many instances where I DID put up with t and went through with a shitty session because I didn't stand up.
I felt more empowered to do that after a few years of experience.

I have heard horror stories where the pimp shows up and demands full payment.
Stay with well reviewed ladies with good reputations and you'll rarely encounter such problems.