I am so angry and dissapointed at Telkom and finrite insurance

I am using a Telkom Cellphone contract, therefore i have cancelled the insurance since November however i still get invoices from telkom with the same insurance still demanding money from my policy, i have tried emailing them count less times and all they do is to read my emails without responding back,when i call them all they say is that it has been cancelled however they still debiting month end, i have emailed them my monthly statements for reimbur*****t however to date no money was refunded and they still going to debit month end, how do i cancel this because both finrite and telkom are not willing to help on this matter.