Republic Banana / Selling bad merchandize and bad service

On 26 April I bought a white shirt from Republic Banana store in South Coast Plaza . At the first place I could tell that the shirt seemed to be washed but I were not sure, then I asked the staff and the answer is " the colour is original off white and the shirt is not washed yet" . When I went home and tried it on . The shirt is loose so I decided to return it . This is time the story begins
First the cashier told me that the sale code on the tag is not match with the code on the receive ???? When we checked the merchandize code on the receive is matched with the code on the receive, then he said the merchandize purchased is not in the record of the banana credit card ( that I used to pay for this shirt ) but In the receive show that I used this credit card to pay for it . So the cashier call the manager of the store . When the manager come she told us that the shirt is washed so she could not take it back . We told her that the shirt I bought few days ago is not wore or washed and the tag is still on so why she could not took it back, she insisted on not to due to the condition of the shirt . So I asked her " Why did you sell the bad shirt to customer and you did not take it back " She said that she did not know why this shirt in the store so I was unlucky one to buy this shirt so I have to suffer the loss . That is rediculous because the store sold the bad merchandize and the customer has no right to return because that is not their fault that they cannot control all the merchandize in the store . Next day I tried to call the customer service, her name is Tracy and she said the same . I told her why did the company sell the bad things to clients and just washed it out of their hand and the loss is belonging to customer . She told me that she is sorry but she could not do anything . I could not believe what I heard . That is really bad service I ever had . The cost of the shirt is only 21.99 usd, that is not big deal but I wonder how many bad merchandizes in the Republic Bananas store that is going to sell to the unlucky customers in the future like us because they cannot control or they have no knowledge about them ??? The irresponsible service is horrible for the big company like them . They should be ashame about this .