call centre sucks

I was told that my account was upgraded on my behalf, then they asked me to email my avidavit and a certified copy of my ID So that they can investigate. I haven't heard anything from them since. I tried calling their 808 number to speak to the consultant but it keeps on being hang up and it's been days now. number 2 is I didn't pay my account and it was for less than R50.00 so within weeks not even a month my balance due went from less than R50 bucks to 267.00 and I want to how? I want my contact to be cancelled and the matter that they are investigating sorted ou immediately. I want nothing to do with MTN anymore