Vodacom - cheating contracts

I cancelled my wifi router with Vodacom in June. My contract was up and I didn't want to renew or upgrade. So I called in and cancelled it. Two months later I am still being debited for the router. When I call the call centre to get assistance as to why, they cannot help me. Tell me I need to speak to cancellations which are only available during office hours so can I please call back tomorrow. No Vodacom, you should be able to assist me in the call centre. What is the point of a 24hr call centre and I want my money back.