Dissapointing customer service

I ussually buy my groceries at Cambridge food, Lemo mall, Bloemfontein because of the cheaper prices than other retailers. Today i went to buy3 x 4kg chicken and the shelf talker says R118. 00 then apparently on the till it rang R121. 99.I told the cashier that it was R118 on the shelf talker of which the supervisor went to check and came with the shelf talker to the guy named Klaas, he says he is the manager. Klaas printed a new shelf talker nd came to me, telling me that R118 price it was for the bones, but how is it my problem? i found that guy's customer service very poor nd i felt disrespected because he argued with me, saying that the 4kg chicken did not have the price on it.As an ex-employee of Massmart i am very dissapointed. I guess he should have voided the price and fix the one on the shelf afterwards. Klaas does not have respect for the customer, he does not care about the dignity of the company. He should get refresher trainings for customer service