Pricing

Worst service ever I Went in to buy shoes and boom I saw shoes that were marked down from R159.99 to R90. When I got to the cashier she scanned the shoes and said the shoes are now 159.99 and I said but the is a mark down and she said no the system said is R159.99.i want to find out if it's my problem if they don't place correct price tags? She had bad attitude and just took the shoes back and didn't say anything to me.Is ncr not saying the price you see is the price you get?