Yes I have. A few times. I will repeat what I have said in the past: Before you approach the door, remind yourself that you have a right to walk. Once inside, take a moment and smile, look her over and make the decision quickly, best before removing your shoes. Simply say, "Sorry, Cancel" - every girl knows these two words. After you have done this once, it will be much easier the next time. Then send a note to the PO immediately and be nice but firm, but include something like, that wasn't the girl I saw advertised. You don't want to get black listed. I've never had a PO get upset. Your 10 minutes later self will thank your 10 minutes before self. Lot of fish in the sea...