Pick n Pay

I purchased three packets of Camel Silver last week Friday from Pick n Pay Hillcrest. When i opened the packets, the filters where brown. Camel Silver changed their filters to white about 5 years ago. In other word the cigarettes that was sold to me was more than 5 years old. When i drew their attention to it, they refused to exchange it. My question is, where did they buy this from and how can they deceive clients like that?