Bad service

I went and bought items on my account ‘ unfortunately I lost the receipt ‘ and the items were small ‘ I went to the same sport scene for an exchange ‘ only to be told that I can not exchange without the receipt ‘ ?... it doesn’t make sense as to why not when the store has a copy of my receipt/ and they the transaction history of my purchase on their system as this was bought on the account

To add on that m the lady that was assisting me’ I’m requesting if can she get a customer service training ‘ she is rude and arrogant