Checkers - Amusing but irritating

I recently bought a pressure cooker that was on a special offer at Checkers Ballito Junction Mall. At the till the discount was not coming up and an assistant was sent to the shelf to check. He came back and said the unit was not on offer. I then had to go back to the shelf and come back with the sign that advertised the offer. A supervisor was called to authorise the price reduction. She then said the unit I had was not the one on special - because the sign said "6l capacity" and the unit box said "6.0l capacity." It took a while to explain to her that both meant the same thing and she eventually authorised the transaction but continued to express her doubt. It was most probably the queue building up at the till rather than an understanding of the capacity description that persuaded her to allow the transaction. It seems like an amusing incident but makes one wonder about the level of training that these individuals receive before being granted authority to make decisions. A very poor reflection on Checkers that a senior can make such a basic error.