Vodacom Insurance

I cancelled my Device Insurance in Nov 2018. However I am still being billed over R170 every month for insurance for my device. I have raised this issue with Vodacom Call Centre where I was advised that I have to pay the full amount of my invoice, including the insurance or my line will be disconnected. I was then advised that the Vodacom Insurance line is not working and that I would just have to keep paying it even though they have it on record that it has been cancelled. I have spoken to several agents since Jan 2019 and they all said they would escalate the problem, and yet there is still no resolution and the device insurance is still on my March invoice.