Wrong priced

I took shoes in teh shelf for priced at R 250 and when I get to the till it scans R 270 and when I was argueing that she tells me it was wrongly priced from the factory it is not their fault and I asked her isn't it that am suppose to pay for the price that am seeing on the price tag she refused to give me at that price saying it is because I am buying on promotion. I thought any retail shop you pay teh pruice that you seeing on the price tag as it is their fault that they do not check their pricings<br> <br> I am so dissappointed ast woolies as it is my best shop but as from yesterday am rethinking my options.