Disappointed with Pick n Pay Woodmead

Very disappointed with Pick n Pay Liquor Store Woodmead. A case of 24 330ml bottles of Flying Fish was advertised at R259, quite a good price. I selected 2 6 packs of Lemon flavoured and 2 6 packs of Apple flavoured to make up a case. At check out this was not accepted as a case but as 4 6 packs at R85 each, i.e. a total of R340. I was told only a single flavour case qualified for the special price. It is difficult to comprehend what difference this would make to P n P. I obviously declined and this left quite a sour taste in my mouth.