Wrong pricing policy in pick n pay kempton square

Yesterday I went to buy a stove at pick n pay n kempton square... It was written in a big board 249... When I got to the till it scanned 349... The supervisor told me that I read wrong then I went to show her..She was speachless... N the manager said it was a misprint... They told me that the wrong pricing policy dnt apply... So does pick n pay make policies that dnt apply????