Misleading information

I would like to complain about shell select store at Lotus Gardens in Pretoria. Their price tags are misleading yesterday it was the 2nd time when I bought items but when I go to the till the price is not what was written on the self or fridge. I bough 1litre Krush juice it says it's R17 on the tag in the fridge when I get to the till it was R23 and Mega ice cream it said R16 but when I get to the till it is R18. That is not good at all. I feel like I have been ********** and the lady on the till was not friendly at all. I was paying with my reward card she was not pleased with that I do not know if it was too much work for her.