Bad Attitude and poor product knowledge

I called in the call centre for the 3rd time after I had been having problems with sending SMSs. Instead of Natalie trying to assist the 1st conclusion that she could come up with was that I had exceeded my funds on my account without even checking which was also not true. She gave very poor customer service. I then asked to speak to her manager and she refused and dropped the call on me. I was very unhappy about her behaviour.