CVS review: Turmeric drink mix

I purchased an item for $19.99 plus tax at 2:19 at the store listed above. Shortly after the purchase I stopped by Walgreens and Publix. I found it at Publix for $11.99 so I went to return the item purchased at CVS with the receipt. I was refused a refund because I didn't not allow them to scan my drivers license. Why would you need to scan ID when you didn't scan when I paid with cash and I had the receipt because the purchase was made less than a hour.