I don't think you are being unreasonable at all... If it is not what they had in the shop, then they need to find more of what they used in their sample and help you obtain some. That would really tee me off since I have trouble picking my colors and always feel unsure of myself. If this happened to me, I'd think I'd just done my wrong and it was my fault. Glad you were able to spot the "offending" fabric. Hope they can help you get some of that which you like.