Advertising complaint against Dis-chem

I have bought some perfume at Dis-chem today. They advertise that all fragrances are 25% discount only for 28 February. They advertise the fragrance that I bought for R595. When I pay for it it show on the slip R725 - R181.25(25%) = R 543.75 When I query this, they said that the R595 was already a promotion so I can't get 25% off that, but nowhere is it saying that it is on promotion. I call the manager , but she said I got it for less in any case, so why am I complaining.