Vodacom Fibre Bad Service

I have been an extremely frustrating experience the last few months trying to get my Vodacom Fibre canceled. Every time I call I get the runaround and a promise that someone will call me back. Out of about 10 calls I received 1 call back. I have been lucky to get through to Breton (Supervisor)and after 2 promises to call me back I am no further. I have no hope of this post making a difference but was hoping for some hope on how to escalate this as I have still have not been able to speak to anyone with a higher authority from Vodacom.

Some advise will be welcome.