I used to work and manage a quilt shop and my advice is to go straight to the owner immediately. It does not matter if the person who waited on you is a relative or an employee outside the family. He could have made a mistake and was embarrased or afraid of what his parent (the owner) would say, but he could also have been doing it and pocketing the extra money. It really does not matter which is the case, the owner needs to know---if it keeps up they will lose good customers like you and believe me, quilters are the most wonderful, generous and caring people in the world, but cross one of us and word spreads like wildfire. Anyone who owns a quilt shop should know this and want to make sure that their customers are happy and well taken care of. Talk to the owner, gently but firmly, stating the facts and how upset you were. I guarantee that they have no idea at all and will take care of you as they should. If they don't, that would be the last place I would go to again.