Misleading prices and bad attitude

I went there to buy myself fresh milk.weetbix and 1 kg mix veg that worth R26.90 then on the till scanned R32.90,then i went back to confirm the price from the guy that is working there he also confirmed R26.90,then i told him that this scanns R32.90 at the till,so i told the cashier the price i saw in the fridge then she reffered me to the supervisor,The supervisor take 10 minutes and came back with the R32.90 tag telling the cashier to refund me he is not gonna change the price for me,Then i stand there for long time he said I am intimidating another customers I must leave the shop or else he will call the police.I was treated like a dog to that shop and this is not the first time I am treated like this.