VODACOM BAD SERVICE

I contacted Vodacom in October to cancel my contract which expires in December. I was told to call back in the first week of December as this is the only time I would be able to cancel. I did this in the first week of December. I spoke to an agent with zero customer service s****s and could not assist me but agreed to call me back later that day to assist with the cancellation. To date I have still not received any call back. I then called Vodacom again and spoke to another agent and and was then told I should have called a month ago and therefore my contract cancellation can only be effective end of January and therefore would to pay until then. Even after checking the system and call logs, and acknowledging that I called in to cancel in October, I was told sorry there is nothing I can do!! And when asking to speak to the manager, I was conveniently told my manager is really busy and can't come to the phone right now. Needless to say I was fighting a losing battle and actually just cancelled the contract and will be paying until end January. What confuses me is why the agents still have nerve to ask my why I want to cancel my contract and try to convince me to stay on as a customer!!! VODACOM service is RIDICULOUS!!!!!