Vodacom bad service.

I had the worse experience with vodacom, I wanted to do a simple upgrade online instead they gave me a new line and contract after 3 months of phoning,emailing and complaining they have collect the new phone and is still charging me for something I have have not used and I cant find a person to help me to cancel the new contract even I though I have collected the phone. I have been a client with them for years but their service is horrific!!