now that depends on the reason that they refuse the money if they think the money is fake they may refuse it and you could have raised issue and told them to call the police but to me this is not worth making an issue I would have asked for the managers name and contacted them to suggest maybe a better training program for employees. However with the fact that these bills are new proper training for may cashiers has not been done and in most business operations will not be done anytime soon. I have not stamped my new bills and doubt I will until they start to make the 20 . I seldom enter anything but 20 & 50 at this time. Some cashiers just are not familiar with this site or money trackers and yes I am sure many trackers have receieved some reluctance from time to time to take stamped money. I only stamp the backs now and most cashiers only look at the face when they are handed the bill.