Misleading labels

Today 19 May 2015 @12.50 went to buy some stuff as i normally do daily. I took canderal sweeteners which had a specials reduced price board below them which was R25.19 to cut a long story short when it scanned R44.50 @ the till i said it was incorrect. Well i had to wait 20 minutes before the manger returned to tell me it was not the grren ones that were on special but the red ones when i told him that the sign is below the green ones which the cashier also went to confrim with me at the aisle he just said they have stock of the ones on special. Now this is becoming a norm in this PNP where the prices are not put by the correct items and then creates a problem for the customers. The manager should have just given me the item because the policy states that the price you see is the price you pay and if the staff are incompetant or lazy they cannot make that the customers problem we are on lunch most times we go to the shop and dont have time to be scrutinising barcodes which is their job at which they fail dismally most of the time.