Bad Service

I am very disgusted with the service we have received from Vodacom , my fianc? took out a new contract a month ago , Vodacom told my fianc? she could upgrade 1 Oct , they said to her that her new instalment would be just over R 400 , the 1st of Nov came and they deducted over R 900 not telling her of any of these extra costs , I suggest this gets fixed or else we will reverse the debits until this gets fixed , I find it very unprofessional that we pay so much every month for this and don't even know why or was never even disclosed to us. We have been told that people will get back to us to sort this out and its been over 2 weeks now with no response!!!!