Bad attitude

We went to Jet Kolonade Mall with my wife to buy short pens for my 9 months old boy. We got 4 short pens that didnt have price as they were the only ones left. When we wanted to pay the lady said no price for items and she checked online and said she cannot verify if those are prices therefor she can't sell us the shorts. I asked if she cant call manager to assist she said unfornately I cant do anything. I said but we took time shopping and why are itmes on floor for sale if you cant sell them to us. She was just having attitude and didnt care to help.