Rude Customer service

I am very unhappy with the manner in which the agent Neliswa spoke to me as a customer. She was plain rude and didn't allow me to finish my questions. She just told me whatever she wanted without taking time to understand my actual question. To make things worse, after I insisted on talking to a supervisor, she explained things in a manner that made me look like I was being a fool. Almost like I am wasting her time with my questions. I'm not happy at all and the supervisor, Keegan, just said he'll talk to her which I did not believe. Is this how you treat your customers? Rushing and rambling on without taking the time to get what is being asked?