Vodacom cannot sort out account queries

I renewed my contract 2 months ago and my bill is a mess. I am getting billed twice for the same thing, and I am being billed for a handset I did not order. That is not what I am angry about. this is .... I have tried to call Vodacom for 3 days. I get put through to 4 different divisions. Eventually the person just hangs up. I have tried about 5 x to call and get through to anyone who can assist. I have subsequently logged a call via email and got an email to supply details within 24 hours which I did and STILL NO RESPONSE. The service is shocking and the inability of the person on the other side of the voice call to assist and understand the account mess is shocking. I wish I had not renewed with Vodacom