misleading advertising.

Why does Pick n Pay bother advertising? They just waste the publics time and money (petrol is not cheap). every time I see something and go to a store I get told sorry sold out, even on the first day the advert breaks. An example is HTH 15 kgs was advertised at R499 when I went to buy get told they were sold out and will not b e getting in at that price....this is the 3rd time in the last 3 months I have gone to buy something at the Hype in Port Elizabeth and sorry to say after shopping at PnP for many many year I have decided they will never see me again. SO SAD, I know they don't bother replying or even looking at hellopeters reviews but still feel I have to express my disappointment once again.