Vodacom Insurance Cancellation

I have called about 5 times and even gone into a branch to cancel the insurance on a phone I don't even use anymore. Last month I went to the branch in Centurion Mall and had a consultant help me contact the insurers and a lady over the phone assured me my insurance will be cancelled within 24 hours. It is 2 weeks later I had already been charged for insurance after that call and I see that Vodacom is still billing me R310.01pm for my insurance... This is utterly disgusting and I'm extremely irritated by this. I had not even received an SMS or Email confirming the cancellation of my insurance yet.