Appalling bad service from cashier.

I went to Ackermans at kanyamazane shoping complex today, looking for a graduation dress for my toddler. I found a beautyful dress which costs R220 and my in my daughters size only one dress was left, decided to laybye it since it was the last one in her size. When I got to the tills the cashier told me that they don't do laybyes on single items that start from 5 and above because it makes their job unnecessarily hard and it fills their store room for nothing, I explained to her that I only need the dress and adding other things will make the laybye to be expensive for me. She rudely told me there was nothing she can do to help even if I called the manager I'll get the se respond. I then asked her if their head office knew about them chasing away customers who wants to laybye a single thing that costs morethan what they have, she told me not to threaten her with head office. I then told her its either she does my laybye or i contact their ROM that's when it was done and all eyes being on me was so embarrassing