Incorrect Pricing

My sister and I went to this store to buy my nephew a lindt bear. We found the bear in the store and below the bear it stated that the bear costed R50.45. We then proceeded to the till where we were met by a lovely cashier who ran up the product. My sister then turned to me and asked "what the price was again of the bear?" and i said "R50.45" then she asked the cashier that "why is it scanning R59.95" and the cashier then called the manager (Melanie) who greeted us and said she will go check. I proceeded to follow her to the aisle where the Lindt bear was and she said oh there is a mistake then she took the other barcode out from behind the other one. When i returned she told my sister that the pink bear is R50.45 but the one with red bow tie is R59.95 to which my sister said but then shouldn't we get it for the price we saw as this now was not our fault to which Melanie then rep**** a flat NO and said that "the barcode says so, so we scan what the barcode's price." My sister was of course not happy and said that it isn't fair and she rep**** "we can't change the price, do you still want it?" This is absolutely horrible not only the fact that as customers we have rights but also the attitude she had with my sister and the face she pulled when talking to her (I don't care what you say you not getting this right attitude) I demand an acknowledgement of fault, because i can assure you that this would not have happened at PnP, Woolworths, Checkers or even Shoprite. Please contact me ASAP to sort this out.