Disgusting how you treat your employees

Picked up a box of plums with a price tag of R19.99, got to the check out and the price was R29.99. I objected to it and the cashier went back to doubleu check and I'm not sure if she made the same mistake but I'm sure the price was R19.99 and she confirmed it. She insisted she will pay the difference from her pocket but I objected. Two manager were called and both insisted she should pay from her pocket. The boss last was very nice but the girl u had a bad stinking attitude, he spoke harshly to the poor young lady as if he owns her and he told me straight in my eyes he doesn't care whether I report him or not. If this is how you treat your employees you have low me as a customer. I will never set my foot at any of your shops. Human capital should be out before profit. No wonder there is a new employee every week. How do you expect your employees to pay for every mistake they make? I'm so disgusted, how much do they even earn to afford that? Worst the guy thinks he is the best thing that has ever happened on earth, his attitude stinks and I just wonder what is going to happen to the poor cashier after I left