Shocking service from Manager and Cashier

On Friday afternoon a friend and I walked in at the Hemmingways store in East London as we saw there was a sale. I found an item which was marked as a sale item and went to pay for it. At the cashier I was told that the item was not on sale but the cashier would call the manager to update it on the system. The manager came and told me that the item was not on sale and that he would go and check the floor. He came back with similar items from the floor indicating that those were not on sale so this one could not be on sale. I am not an Edgars employee and therefore would not know what is on sale and what's not on sale! I don't know what an item that was marked down was doing in the sale area and no one bothered to take it off. The manager did not apologise for this, instead told me it is not his fault or his staff's fault in a very rude manner telling me that he can't control what happens in the store as there are many customers that walk in. The arrogant cashier then chipped in to say that maybe the customers put the sale tag on. I do not know what policies you have in place but this is very disappointing from a big store like Edgars.