Rude, Unprofessional Cashier/Supervisor at Rosebank Counter on 12/Nov/2019 @ 18h41

I bought a cream dress for R899 at the Sandton store and it was the last one in its size. The were pen marks on on one of the pockets which i pointed out to the cashier upon checkout. She marked my proof of purchase with the notes "dress has pen marks" on it. I then told her that maybe il go to anaother store and check if they have the same dress in my size, to which she told me only Rosebank stocks the particular brand/style and they close at 8pm so they can help me. The reason i decided to buy this one regardless was that it was the last one and i wasn't sure if Rosebank would have my size so was willing to take the risk and go wash the pen marks off or something. So i get to Rosebank and find the dress in my size, clean and perfect and i was happy that it was the last XS on the rail. The lady at the counter salesman 160203 then called the supervisor who happened to be working at the till right next to her to authorise the exchange for me. Now this supervisor lady tells me in the most rude manner in front of other customers that "sandton shouldnt have sent you here because faulty stock is the problem of the store, why didnt they call us" I reposded by saying "well i was not told that, i was told to come here as you are the only other store that stocks this brand'" ...to which she responded "well im telling you now"!!! I found her demeanour and tone very demeaning and disrepectfull. I did not respond further because i did not want to get into a verbal fight with her and decided i will bring it here. My issue with the supervior apart from her unprofessional conduct is that the speech she gave me is not for customers. This is what should be told to cashiers at their training. I should not be expected know/master store rules. Im just a customer of their product. Why didnt she call the store if she didnt believe me. What happened to being courtious towards customers!!! i left very baffled, disappointed and feeling very disrespected. I deserve better customer experience,