Price discrepancy

i went to Checkers Fairlands walk to buy chocolate that was on sale, 3 nestle chocolate bars for R22.00, yet the shop has it on as R30.00 for 3 . I called them to let them know the error and the lady answered and she said she is unable to assist and said she will transfer me to the managers office and no answer phone rang with out any one picking up. i was at the shop at 12:15. The chocolate bars are R8.99 on a normal price, if they are charging them R30.00 for 3 it means they are over charging us customers. i didnt buy them because i saw the price. They didn't even price the Future Life products that are R60.00 for 2 are not priced