Wrong pricing

I walked in Edgars Sale shop in Joburg i saw a nice pair of Gold sandals which were on sale marked R42.00...i took them and i stood in a long Que when i got to the till the cashier scanned them and told me their price is R375.00 or something...i asked her why did they mark them wrong she had no answer..i asked her to call her manager who came by the name of Gugu SIthole....i related the story to her but she gave me a lame rather unclear explanation that i'm yet to understand as to why they marked the product wrong. She told me the sandals are an international brand which i have never heard of or seen before. she did not care that i stood in a long Que only to pay with my time for their negligent and she did not even apologise. This is unacceptable they should take responsibility for their faults not shift the blame to other customers or give us lame explanations.