Vodacom beyond useless

I contacted Vodacom regarding cancellation of my contract. I was persuaded to take a offer for data and voice at a very reasonable cost. Thereafter only the data portion was deducted from my account. I tried numerous times to rectify this with the retentions department. It takes extremely long to get hold of a consultant only to be told that my number is on an old system and they cannot help me. I have left my details etc but I don't get a call back. I have probably tried 10 times with different consultants.