Vodacom hiding behind Call Centre's / Recordings but unwilling to help you

I have been trying to cancel expired contracts on my account for 18 months now. Meanwhile I am still being billed. All communication needs to go through Call Centers but Vodacom refuses to recall these communications when you are disputing your account. I have refused to pay my account which lead to legal action being instituted. The more I stress the situation with the Lawyers / Vodacom the more unwilling everybody becomes to correct a mistake on their side. Vodacom, this is pathetic. I will only engage further on this matter via email.