It has happened to me. Even though I had called and showed promo, still hesitant. Seems the boss puts the foot down on the fineprint, and if a girl gets charged extra by the boss if not following discount procedures to a T, the boss is inflexible and wants her full price. So can't fault the girl, maybe ask the promoter to make it right on a future visit. I would suggest DMing
@JimiNY as he seems to be on point here. Best of luck.