Rude Service

I bought a track top for my little one, then i lost the slip, when i went back to return it with the tag still on, Selina who is a cashier told me a way to get off, she was so rude she spoke to me as if i was out of my mind, i asked her is the right way to speak to customers, she didnt care, because she knows nobody lay a complaint about them, Her manager told her to exchange it for me she was so full of **** she didn't want to do it. She was very disrespectful, she wanted to prove a point to her collegues, just because the store is dominated by african customers who do know their rights as customers they just mistreat customers which is not fair