Cashier's code of conduct?

I wonder if the cashier's code of conduct is still a thing, or if it ever was. Or maybe it's voluntary?

In the last week, at two different major retailers, one a nationwide everything store the other a very large grocery chain in BC did not have prices at the til as marked on the shelf. One was buy one get one free, the other, was a $20 difference on a single item.

If I was not so observant, I would be grabbing off the shelf, specifically because of the sale, then paying full price at the til.

Neither one gave me any kind of additional break, ie. Free or $10 off as is described in the cashiers code of conduct.

So if this is not a real thing, how do we hold these retailers accountable? Do I just take these establishments off my shopping list?

I feel like they are ripping me off on purpose.

Jeff Frank, Kelowna