Staff not nice rays, training on politeness would ...

Staff not nice rays, training on politeness would be interesting for a number of employees.
I would like someone to explain to me what is it that a customer can scan the bar code on the product or on the label of the department, since the price is the same, moreover confirmed by the employee who allows himself to verbally attack the client.
More and more often price errors between the actual price to pay and the price affixed 'of course benefit to the store, a ray employee's answer' it's just a mistake, after all you do not have to be at a few euros or a few cents. No it's true, you have to pay more than what is displayed, but I guess the employee when he is in the store as a customer at the same rection as other customers, he wants to pay the right price and no more expensive than what is displayed.
More and more rude, staff members who allow themselves derogatory reflections!