Beware of pricing at this Caltex!!

So this may seem trivial and not worth complaining about. I bought some biltong at this Caltex and after I had swiped my card I realized that the total was a lot more than I had anticipated. After fighting with the cashier to get my slip (as per the cashier the debit card slip is also the slip) I checked the pricing on the biltong. Now i know i have paid R30.00 for this before and now it is R48.00 for the same thing. I went back to the shelf and saw that it stated R30.00 I brought this to another cashiers attention and all she had to say was '\but it is R48.00"";false advertising and charging more is practically *****ing from your customer!!!"""