Vodacom swindling it's customers

I had an incorrect bill for my vodacom Account. I notified vodacom about this issue. I was then told that I had to contact another department. After speaking to an agent from the call centre it was then established that I was being billed for cell phone numbers that I did not own. I was then advised to contact the ***** department. the ***** department told me that they would investigate the matter. I have had no response from them. Whenever I try and contact the ***** department for an update on my case they transfer me from one agent to the next. I've been a vodacom customer for over 20 years and find that this behaviour is appalling. This issue has been going on for over 5 months and i keep being billed incorrectly.