Vodacom bad business practice of avoiding cancelling expired contract

I have been trying to cancel my Vodacom contract for my two lines whose 24 months contract ended on 16 October 2020 but Vodacom keeps dropping my calls and persuade me to renew my contract even when I inform them I don't want to. Today the guy called Kleintjie kept me holding for over 30minutes and he didn't give me reference number of the call and he said he will try to escalate to his Supervisor and I should wait until next week Tuesday which is another delay tactic. My Consumer Rights are being a infringed. I need this matter resolved ASAP. ***