I went back to the store, took two polo's, head to the cashier and showed him the recipt. He refused to accept it, so he called the manager and he was so tolerant because I told him about what happened before and it's their mistake for not calling me when it's arrived. The manager took the recipt and told the cashier to make me pay only for one polo and the second one is free.
I guess they have a bad and a good in treating a customer. So what do you think about what happened ?