Incorrect prices

The products are very often incorrectly priced. You see one price on the shelf but when you are at the cashier, it's a few Rands more. The owners are Muslims. They ought to know this extra income is haram because it is earned via deception. I wonder how much extra they make by deceiving customers like this. They can't blame their staff because of you pay peanuts, you can't complain if you only get ******s working for you.