incorrectly charged

I was over charged on my debit order so proceeded to call vodacom customer care. The operator could not assist and promised she would phone me back. 2 weeks went by and still no call back. I phoned customer care again today and after waiting for 20 mins on old. Was transferred. They told me nothing I did not know with regards to my account and why I was over charged. They did not even know that I had been overcharged! After telling them my actual bill and what I had been debited. They hung up the phone. <br> <br> This is the second time this year I have received such poor service. I wrote on hello Peter and January and nothing ever came of it.