Billed for insurance when its been cancelled

I have a vodacom contract and have cancelled my insurance in May 2019 and was advised that it was cancelled. i am now being billed for June 2019. when i contacted vodacom they advised to speak to Finrite which i did and was told that the administrative department will have to look into it refund my account. when i asked who i can contact to get feedback i was told there is no way to contact them. i am still waiting feedback and it seems like not even vodacom can assist me which is ridiculous cause vodacom advises you to take insurance with them