KFC Grayston Drive through rude sales consultant

I had a horrorific experience yesterday 14/08/2015 at the Grayston KFC in Sandton. I stopped there to buy some food with my wife and daughter at their drive thru. The sales consultant was busy talking to someoneelse while taking our order and missed the first order. I then pointed out to her that she missed the first order as we could see from the LCD screen the list she had done, she rudely shouted that she didn't an argument ensued and when I pointed out to her that she did not have the street wise 2 on the list she then punched it in and continued to argue and shout that she had not missed it, I told her to stop shouting at me, she then said \ Just go home and F*** your wife"not realising my wife and daughter were in the car with me. My wife became livid and asked for the manager on duty (Name tag Nicholas). The lady continued her outbursts infront of the manager who was apologising instead of calling her to order. I told him we will not accept his apology as he could not even call her to order. We called Wuter the senior manager who said he will first hear his staff's version and sounded disinterested and offered no appology we called Isaih the regional manager to no avail."""