Supervisor shouting me at pik n pay Woodmead

Picked up a juice at pik n pay Woodmead for 39.99 on special. When I got to pay it scanned for 49.99 so I asked the cashier to please check. She sent the supervisor who came back and threw the special ticket on the counter and said it was for another flavour. I tried to explain to her that it says assorted so it applies to this flavour as well. I went back to the fridge and see that all the price tags had been ripped out. I then told the supervisor what I had seen and she started screaming at me in front of all customers and says I must not accuse her of ripping prices off.

Extremely poor and embarrassing service from the supervisor who is supposed to be at a middle management level.