Cosmetic connection suck!

I had a terrible experience at cosmetic connection in Eersteriver today. I bought Aunt Jackie hair gel and when I got to the car I saw that the product has an ingredient that I am allergic to. I immediately(2 mins after purchasing) went back to the store to refund the product but the shop assistant refused as the store policy is only exchanges no refunds. Take note there is no notice that stipulates this , the notice only states that hair pieces cannot be exchanged. I am extremely upset because now I was forced to take a different product that I didn't want. have been buying from the store/online for years Cosmetic connection won't be seeing me again!