Check your slip

Always check your slip after purchasing at Clicks. Inevitably they will charge you a different price than what is displayed on the shelf. Bought a desk fan and they charged me R169 while the price on the shelf was R139!! Centurion branch. Bought a hairdryer at the Southdowns branch some time ago and was also charged more than what was displayed on the shelf. Are they just sneaky charching more (because it’s always more) or just ***********?