Dischem disgusting service

I bought sunscreen (Avene) from your Blubird store. Biggest regret of my life. The sunscreen it turns out, makes people with brown skin look ghostly ****erally has a white film to it). I came back to return it and the rude cosmetics manager tells me that's how all sunscreens work! The nerve! Firstly that's a lie; millions of black and brown people globally use sunscreen that doesn't leave them looking pale and secondly if thats how it works why is not represented on the box BEFORE I BUY IT?! I want a refund! To say I'm disgusted is an understatement. I'm more shocked by your customer service than this horrible sunscreen to be honest! This manager actually had the nerve to tell me "the only reason why eucerin worked for you is because you used the fluid sunscreen" I HAVE NEVER USED THE FLUID SUNSCREEN!!!! WHAT IS SHE TALKING ABOUT?!