BAD policy

I went into the Woolworths at Trade Route mall. I have been searching everywhere for white tights for my niece and was delighted when I found the last pair size 6-7. when I went to pay for my item, I was told that she was unable to sell it to me because it was part of a set and the dress was missing. Because I am so desperate I said that I will pay regardless of not receiving the entire outfit, she went on to say no. Together we went to the place I found the item and we found another odd dress size 9-10 or something and I said fine il just take that dress since its also not attached. I was told that they will end up giving it to charity because they CANNOT sell me the item of clothing. I understand that there are policies in place but please don't tell me that I cannot purchase an item when you have it in front of me and I am willing to pay for it! The fact that all the clothing was mismatched and missing due to theft as she said, is NOT my fault. I am VERY disappointed.