Review Ridiculous service at Clicks Richard's Bay.

I have just been to clicks Richard's Bay boardwalk centre and I was assisted by a staff member who told me that sensodyne toothpaste is 3for2 when I got to the cashier it scanned normal price, however I asked the consultant numerous amount of times and he said he is sure that it's at 3for2 and we must call him if it doesn't. To cut the story short a lady by the name of Kiki or Keke Mthembu who was the manager in charge at that time came to the till and said I am taking advantage of the fact that the consultant is new and she walked away from the cash desk. My question is how am I to know as a customer that the consultant is new? She could have at least taken her time to apologise for the inconvenience caused and I would have left a happy customer that lady is extremely rude and does not know what customer service is....