Bad attitude

I went to vodacom outlet in Gandhi square, Johannesburg at around 16:20 to port back to vodacom network. The lady at the counter promptly attended to me and referred me to have a sit for the available consultant. There were two consultants, young coloured gentleman in his early 20's and a young african lady small built and beautiful speaking setswana. I was then attended by this young african lady. From the first contact I could tell she is not in a good mood for customers, and even the way she was attending to another customer (gentleman) just before me. Her attitude was bad and I tried to ignore it for the sake of being assisted. After I explained what I was there for she checked on the system and the next thing she was shouting at me saying that why I did not tell her that I tried to port back previously which I controlled my temper and calmly reprimanded her about her attitude, but that did not help. I then stood up, took back my ID and proof of address from her and walked out as I could see I was about to lose patience on her attitude. Her attitude is the direct opposite of her looks and I am not sure if I would want to go back to vodacom after such encounter with that lady.