What's it that you have stolen?

I got into mr price at paledi mall Mankweng looking for earrings when I entered the store had my hands in my pockets then I went straight to the earrings section. I didn't find the colour I was looking for so I immediately made my way out as I was passing by the security he said what is it that I have stolen? It was really offensive what happened to innocent until proven guilty. I took my hands out of the pockets and showed him that I was holding my bank card and told him that I am not a thief. I was really disappointed by that.I looked for his name but there was no name tag visible