Account Enquiry, get absolutely zero feedback.

I have had a cell phone contract with Vodacom for about 18 years and this is the 1st time I have to complain. My monthly account has been the same more a less (R50 -R100 difference at the most). January I received my account and it was more than R600 of the usual amount (R1000). I was very shocked about the increase, but thought maybe it was due to all the phone calls during the holidays. My February account came and it is R3563. This is totally unacceptable and I phoned the call centre on the 11th Feb. I've explained my situation and was told that an investigation will take place to establish where and when data has been used. The call centre operator told me that I will have feedback within 72 hours. On the 17th of February I had no feedback yet and phoned the Call Centre again. Spoke to Riyaad Roy who was very helpful. He explained that Candice Major is responsible for the investigation and that he logged my call and that Candice will phone me within 24 hours. Today is the 23rd of February and I am still waiting for Candice Major to give me feedback. Ref 53-8XJ30-047K. This is unacceptable.