Disappointed from Woolworths service

Good afternoon Today I just bought 3pk BS tights from Woolworths now at 15:57 and I called at 16:25 to exchange because I bought wrong colour.and thy told me thy can't exchange them because we damage the box 159 it's a lot of money .what am I going to do with them it's for my daughter at school it's cold now. If she was wearing them n tomorrow I called it will make sense but she didn't wear them .I called after few minutes for exchange. If I was a white person thy were gonna exchange it but m black that is why m getting such response