Incorrect Pricing of Items

I purchased tikka breast fillet, the sticker on it says TRY ME... I'M NEW, price on package is R36.29, I got charged R37.00, 0.71 cents more than what I should have paid. Numerous times I have been overcharged on marked down items. In the past I have gone back and have been refunded but the inconvenience everytime is becoming a schelp. If I am short every time I go to Pick n Pay would I get the items I purchase? The price on the shelf versus when u get to the till is different. They need to address this matter as there is clearly an issue with their pricing system.