Bad customer service

Went to Clicks today at 13:45 shopped for a lipstick no one helped me by that department helped myself a lady was sitting down counting what seem to be a stock I greeted her and kept looking on lipsticks she never offered to help me at all. Finally I bought a lipstick didn't see any testers. Went to pay for it I tried it on only to find out I didn't like the color went back to the store to ask if I can exchange it supervisor or manager in charge of the shift refused to exchange it for me as she said I have tried it on . I told her I did try it on due to them not having testers I didn't want my money back only wanted to exchange with what I like she refused. My question will be has the staff been trained in dealing with customers do they know what is customer service . First they were never available to help me in the floor , secondly having managers who are willing to let the customer leave the store unhappy because of their poor service. I'm honestly disappointed in the service I got from Clicks Fourways crossing. It wasn't about money all I wanted was to exchange.