The cosmetic company

I made a purchase based their advertising that everything would have 50%off. However, they overpriced. I checked the brand website for the original price.
The products are Tomford boys 3pieces of mini lipsticks which worth of $86 originally, but they marked up the price to $150. Even after 50%off, they still would be$75. I requested to return or exchange. And I was refused.
I feel I was cheated by their advertising. They were not actually 50% off.
I have the receipt and brand new products with me.
I also can offer the pictures of them.