Poor/ invompetant service

I have previously written a review abour vodacom insurance adding comprehensive insurance onto my account. On publishing of my review vodacom contacted me twice on the following day admitting there mistake and promising to attend to and fix the problem. I needed to be credited for incorrect insurance added onto my account. However this can only be fixed if the account is not in arrears. I pay my bill every month, but I will not pay for services I did nit request and which they have confirmed is a mistake from Vodacom insurance. On the new months bill the insurance is again added bringing the total amount billed to me by Vodacom to just over R1500.00. In a company as well established as Vodacom with probably thousands of IT specialist employed by the company they can not fix a refund for there mistakes and the consumer has to pay to fix their errors