Bad service at Dunns Carletonville

I bought a navy blue dress at the store, the blue was darker at the back, on Monday I took the dress back because it was small I wanted a bigger a size, the manager Molly refused to take the dress because of the stain she said that stain was oil and she even advised me to get it washed and return it the following day,on her refusal she said that at all times upon a sale her cashiers checks the items before selling them, I told her that what she is saying is impossible, I asked the cashier if she had checked the dress she said no she didn't, then I asked for the head office number instead she called her regional manager Emmanuel which she said to Emmanuel what her thoughts were until he wanted to tell me that they can't change bcos of the stain, I then told him that she told you what she wants to hear not what has been happening, then Emmanuel told me that I can wash the dress I refused then he said the store will do it, he then asked to speak to Molly that was instructed to wash the dress, I went back yesterday ( Tuesday) they cashiers changed the dress and when I asked where Molly was they said she was busy. Molly your service sucks you even had the odesity to tell me that you have been in the field for over twenty years you know what you are talking about, well Miss customer service has no length in service it stays the same and can only get better with time.