Shoprite Checkers review: Consumer act read the law

Today I was so disappointed I work at somerset mall and use the checkers at somerset mall and i have always had pleasant experience besides this day. I entered the branch saw a special advertised 29.99 for a lettuce, cucumber and baby tomatoes. When i reached the cashier they said no its not a special then someone collect the signage and showed the cashier. They then called a supervisor kyle was his name who assisted an acknowledgement of the error but when making the correction said its a 15% discount. Wow! advert and what i got was not what they confirmed anyway i doubt i will go back. Pitty...