Inappropriate treatment at Woolies Clearwater

I'm so disappointed at how I was treated at Woolworths Clearwater mall. I was shopping with my daughter, bought clothes and groceries. Went to the till and paid. My daughter who is 4 years old took a children storybook and put it in the trolley. Now this book was visible and when I was paying for the other items she had it in her hand. My intention was not to pay for that storybook. My daughter innocently put it in the trolley. As I was about to exit woolies, those security pillars start beeping, I realize that it's the book. I give it to the security guard at the door and explain to her that my daughter put in the trolley and I was not aware of it. I show her the slip of everything that I paid for and that the book was not part of the items that I wanted to buy. The security guard then contacts the people that look at cameras I guess and I was told to take back the book where we found it. I walk back into the store, my daughter shows me where she found the book, and I put it back. As I was about to leave the store, the security guard asks if I paid for the book, I tell her no because she said I must put it back where I found it. She then insists that I go back and pay for that book. I did that and left. I'm not happy that I paid for the book that I ddnt want and if it was a white person, they were not going to be treated in this manner