Over charge

I bought some cereal at Checkers last week Thursday for my child including general groceries but when i came to tillpoint when they where scanning my products i noticed a jump in pricing on screen when i paid i checked my receipt and noticed that the last item scanned was my daughter's cereal which was scanned as a 3-4year old floating costume which they charged me additional R280 for so i luckily picked it up when immediately scanning through my till receipt before leaving the store but if i had left without picking it up it would have been in vain tryiing to get a refund on my money..People be vigilant when paying for your products or groceries at till points.