POOR SERVICE FOR FIRST TIME CUSTOMER

I took out a data plan with MTN and was supposed to pay R339 mp however, on my first deduction date they took R1647 from my bank account. I contacted their call centre which they advised that the difference would first be credited to my MTN account then I would have to call in again if I wanted to have it paid to my bank account. When I called back they told me that it would take a few days to be paid back to me, this was on the 1st of October. Today(17th) I call again to check the progress of my claim and I was assisted by Phumzile who told me that it would take 21 working days for me to get my money back. I then asked her if it would then not be easier for me to go to my bank and reverse the debit order and pay MTN what is due to them of which she answered that if I am able to do that, I can. I further asked Phumzile about the implications this would have on my account andy credit rating and to this she rep**** "I dont know" I was unsatisfied with this respond and I told her of which she went on to say "contact transunion and enquire about your credit rating, I work with MTN I don't work with credit scores" At this point I'm upset and she is rising her voice and speaking over me until I ask for a superior, 11 minutes later, I speak to Narisha and I give her background of the whole matter and how unsatisfactory I find her staff to be dealing with the matter, after explaining all of that she gives me the "hello, hello, can you hear me" then the phone goes off. As a client of MTN, they have all my contact details but did not bother to call me back after the call was "disconnected" I find this to be VERY POOR customer service from MTN firstly for taking money that they were not supposed to, then dragging their feet in resolving the issue and then for me to get such attitude from Phumzile and the lack of eagerness from Narisha who did not bother to hear my complaint and at least try to resolve it. MTN is a big company and I'm very disappointed about the treatment that I have received since joining the network. Its pure lack of interest for a client care agent to be telling a customer that she does not know and not even offering to ask a superior in order to put the client at ease and for her to be referring me to Transunion when MTN was the one that put me in this position to begin with... This just shows that MTN does not care about their customers.