Spar false advertising

Spar, Rietfontein rd in Witfield. This has happened before, but if u confront them, they just say sorry u can't have the product at the promo price. They r advertising Mrs ***** chutney 470g at R17,99. Nothing about selected variants only or anything. I tried to buy one of the new variants jalapeno and I was told it isn't part of the promo and it's R22,99. Surely if a promo states a product and a certain size, surely all of the variants with that size should b the same price, unless stipulated selected variances. This is how they cheat the customers who buys from them daily cause they know they get away with it every time!!!