Unhappy customer

Visited Woolworths Masgrave to exchange a mistakenly acquired item, a t-shirt instead of vests. It wasn't even worn, only the wrapping was imperfect. Azra, the store supervisor, refused the exchange due to the impaired packaging. I'm displeased with this outcome. The supervisor exhibited arrogance. I fail to comprehend this policy, as the receipt contains no stipulations regarding packaging condition. Consequently, I'm compelled to retain an unwanted item, and they retain my funds. How does this constitute acceptable customer care? How can I maintain confidence in Woolworths? I demand a refund or replacement of the item.