Disrespect and poor service

I called Mtn call center and I wanted to do a simswap and the lady sounded as if she is asleep on top of that in the beginning of the call after I told her that I needed a simswap she said it wouldn't be possible when I asked why she then started to ask for the numbers and while doing a simple swap she didn't ask me all the questions. She just asked a few questions and when I asked why is she not asking all questions she **** to me and said the system chooses questions for her then I told her that I know the system their using is Siebel and it doesn't choose questions and I then asked for the supervisor then she kept me on hold without coming back to me for 23 minutes and then she dropped