Poor service from kwt

I visited pick n pay in king Williams town. I bought fruit- buy 4 for R100. I chose mango, g****s, nectarines and naartjies. All the fruit had stickers on it. At till i didn't get the discount. Manager was called he said I must look at picture of adverti*****t and naartjies was not on picture. I asked him about the sticker why there is a stickers if it's not on special. He didn't even apologize about the error and he asked if I'm taking or leaving the fruit. He exchanged the naartjies with nectarines. I bought naartjies alone. I wish he can be more responsible and improve on customer service.