Unfair treatment

This morning I went to the Pick n Pay Family Bophelong in Ivory to buy a pack of cigarettes like I usually do. I have card that I use to buy groceries, so I used this card to pay for the box. They swiped my card and the funds were deducted but they refused to give me the box because the card does not require a pin and I always use this card at the store but have never been treated this way. I left without my cigarettes but the funds were deducted. I was treated unfairly and I should get my money back or my pack that I bought.