Here's my experience, it happened some time ago but I remember quite vividly...
Lady at Marketforce called and in assigning me a location, told me the show times I needed to attend for trailer checks. All late morning showings. Apparently there was one at 4:30 as well that I was supposed to do. I was getting the basic pay, which lets face it, is not worth it when you live over 5 miles from the theater, to leave and come back, nor to sit there and wait 4-6 hours. I went home and turned in my report.
Guy from Marketforce calls me and complains that I missed one. He's asking if I submitted the report in error and intend to go back. I told them I was not informed of the later show time and could not return to the theater because I could not get child care at that time on such short notice. In the most arrogant, obnoxious tone of voice he says, "I never said that." Genius guy, I didn't tell him, "You didn't me," I said, "I wasn't told."
Rookie mistake, trusting that they would give me the correct information rather than looking up the showtimes online myself. All of my assignments I had lined up were removed including a few that I self assigned at a later date. I haven't done a movie theater assignment with them ever since. Not that it matters much. I did them more out of fun and for the quick pay out. The pay itself isn't all that great when most of the theaters aren't close to you.