Debonaires Pizza Maponya Mall overcharging you, check your receipt before you leave the store

So this is the second time I write a disappointing review on the very same Debonaires Maponya Mall, they are very good at terrible customer service, and yesterday I experienced it again, which served as a lesson to me to stop going back there! I had simply gone there to buy a real deal small pizza for lunch and asked for added single extra cheese! And it cost me R42.80, which in my mind didn't sound right, as I looked at my receipt the real deal costs R24.99 and the cheese cost R17.90 which is the price of extra cheese for a Large pizza and the initial price one is actually supposed to pay is R9.90 for extra cheese for a small pizza, so I asked the teller why am I being charged extra cheese at the price of a large pizza when I actually purchased a small pizza her response was ridiculous and potentially sad to say the least, she said they were told to charge us that way as customers were complaining that the extra cheese from a small pizza was not visible so instead of rectifying their issue, they chose to charge us R17.90 extra cheese weather its for a small pizza or not! How ridiculous is this gosh I had to take a picture of the receipt with disbelieve.