Price on shelf and scanned price not the same

On 4 different occasions i have had the same problem. Price on the shelf and scanned price at the cashier is not the same. First incident: Price on item says pay R20, scanned at R27. Second incident: Price on item 10% off, scanned at normal price, third incident buy 1 get 1 free scanned both items as normal, today's incident, musgrave branch had R10 off item, but no stock of item, windermere had stock but no R10 off. Please watch when items are being scanned. Manager that assisted at Windermere definitely needs upskilling.<br> <br>