Perfume is 25% when you buy the second one is 50% but I have to pay one for 25% not 50%

There is a promotion on the Foschini Beauty you buy one perfume and the second you get for 50% off. The second perfume I choose was already on 25% mark down from the original. Why put 50% off the one that is marked down whilst is 25% off. That’s daylight *******. On the 25% marked perfume on the picture it’s states 50% off. When I call the Bash contact center requesting clarification they hang up on me and they are very rude with me. They tell me it’s not their problem. I have never once experienced this kind of treatment from the TFG before. All I want is clarity.