I had something similiar.
Last year I contracted with Roxanne with a beautiful chica, for a 1 hour session, followed by a lunch date with me, my friend, and his chica. When she got there, she wanted money for the sex hour, plus money for the dinner date. Even though I was going to buy dinner. Since I can't speak spanish, the whole deal was about to go bad, but my friends girl, Libya, who speaks great english, smoothes it over. But the girl never was as animated as our first session, when it was just an hour for sex, and nothing else. Lesson learned. They don't give a shit about you. You are going to pay for their time one way or the other. I'm going to pay for the sex, and eat on my own clock and dollar.