Unfair treatment

I bought a jersey from the above store and when get home the jersey was little bit small.I could not fit on the jersey and I told the lady if it is small I will comeback and exchange.I am well known by the lady since I was buying for the third time there and the lady agreed that I can return it.The day I went there she said to me unfortunately she doesn't have a bigger size and she will order it for me.Since it was a weekend she said to me I can come on Monday to fetch the right size but unfortunately on a Monday I could not go because of being busy at work and decided to go on Tuesday 20 augast 2024.To my surprise she did not receive the right size and I ask if I can get my money as there is nothing else I would like to buy.My interest was on that jersey.Now she told me that the policy does not allow that of which I was never told that instead she will give me credit note that I must always come to the shop and see if I can get something else.She totally refused to refind me my money.I think this is unfair for me as I need my money to buy a jersey somewhere else.She even said I can even get something even in summer.To me this is unfair.I need help.I even asked to speak to a manager and she said she is not there and she is even not allowed to give me the number of a manager.Please help.Regards Nomarashiya Dyokwe