false information and deductions without service

On 12 December I filed a complaint against Vodacom. On the 13th December they phoned me back telling me that they investigated the case and that it turned to my favor. They said that they will phone back in 3 to 5 working days to confirm balances they owe me, which never happened. Meanwhile I received phone calls from their account department, telling me that I owe them money. I contacted their customer care line immediately and I was promised that they will come back to me with a solution before 17:00 same day. (18th December) It never happened. This is totally unacceptable to get this kind of service from a leading cellphone company (I once thought). I'm very disappointed in Vodacom's service delivery and would like to see urgent attention to this matter.