Had something similar, they didn't show up because I didn't pick up the phone...it was an 800 number or a blocked number, so we didn't answer it, thinking it was a telemarketer. They said I didn't confirm on the day of. I said, the original request should have been enough, and should have had your name on the phone call. They disagreed. That they outsourced it. Not my concern, the schedule was with them, and the phone call should have come from their number.