Unhappy customer

On the 15 of january I put a lay-bye for a Jordan 6 Retro, size 3.5 and they showed it to me and said they are going to put it at the back for me. As I kept going back to go and pay there was a size 4 jordan which was for display i even went with a friend to show her the shoe I was going to buy, but we only looked at the display one. Today I went to pay off the last debt and take it with me only to find my baby's sneaker DIRTY I asked the teller girl why it was dirty because my child did not even fit on the shoe, she told me she did not know and that I should ask the person who helped me with the lay-bye but his was not around, I paid it and went out. As I was shopping around I got really upset, because I did not get what I purchased and on top of that I did not get a reasonable explanation. So I went back to the shop and got the guy who helped me with the lay-bye and I asked him how come my baby's shoe is a size 4 and dirty because he told me the size 3.5 was the last small size in the store only size 9 left. Then he said the shoe that I bought was the one on the display and people fitted on it, then he said \sorry sister but if you just wash it it will be clean"like really?"""