Adidas — Shoes/denied sales

I just visited your store at sitara mall Faisalabad, Pakistan, with my family we choose 2 pair of shoes for my son and some garments for my wife and a cap and after that I choose a pair of shoes for me and suddenly the other sale person told that this pair is reserved for another customer. I argue with him that is this company policy? If this pair was blocked for someone else then why they showed me this? It hurts my feeling a lot and I have decided that if company does not take any action then I will never buy adidas products in future.