Manager attitude towards his clients

I bought a pair of pants at Jet-Pretoria North - Northpark centre on Sunday 29th March 2015. <br> Coming home I realize that I took the wrong size and went back on the Thursday 2nd May to change it for one size bigger. I notice when I was looking for the pants in the store that it was now between the sale items and found the right size.The clerk behind the desk was really friendly but I believe new and said that he first have to ask the manager what to do because there was now a R50.00 difference due to the sale price.I said ok because I myself was not sure how it works.After he returns and was busy to explain to me that he has to charge me the old price the manager also appear from outside him office. Without even greeting me he asks me if I am at his store to ***** from his store.I was totally confuses and tell him that he can see that I have change the item not for the same size to score a R50.00 but a one size bigger.If I credit the pants went out come back and bought the same size he could tell me that I ***** from his shop.I was really humiliated in front of all the other customers standing in the queue.I just need to say to this manager that I never ever ***** from anyone.