Faulty headphones

On friday I purchased headphones from Cash Crusaders Rosettenville which turned out to be faulty. When I went to exchange it I was told they don't exchange headphones. Is it because they know their products are pathetic? Why can you exchange everything else but not headphones? <br> <br> After a while I was adamant that we are going to exchange it, and I asked to see the manager. Apparently he/she was in a meeting and just like that, the woman gave us another pair.