PICK AND PAY MISLEADS SHOPPERS ONCE AGAIN

I often shop at the Pick n Pay Woodmead in my lunch hour and most often than not there is a pricing issue. The price you see on the shelf is NOT WHAT YOU PAY AT THE TILL. I know how this works, i will be asked to go to back to customer service where they will walk me to the isle to prove the price i saw was correct and then they will refund me whatever the difference is. Well Pick and Pay, who pays for my petrol to drive back to the store and who pays for my time off work to sort it out ??? I am much better off shopping where the price doesn't change when you get to the till !!!!. i purchased a tin of coffee that was marked R25.99 on the shelf and when i got to the till i was charged R31.99 ???