Incorrect pricing

Today (Thursday 5th of September) I went to Fruit *****s Market in Brackenfell to buy an advertised item 3 x Food *****s Feta cheese advertised for R90 valid for today ONLY Thursday the 5th of September 2019. When I got there the price was R 100. I asked one of the staff and they said that R100 is the price and not the R90 as per the Tyger Burger ad. I even presented a picture of the ad that CLEARLY showed R90 at Brackenfell for today. They then had to go to management to override the price. I asked the supervisor why there's always problems with advertised prices and she said that management does not change the prices. This is now not the 1st or 2nd time this year that the prices is NOT on the shelves as it is advertised, and everytime I have to waste time and jump through hoops to get the correct price. This is totally unacceptable, and it's like it's getting worst at the Brackenfell branch.