Cell C Getmore activated without permission

I received a phone call from Cell C Getmore, trying to convince me to reactivate the service. I told the operator why I cancelled, she told me that they have made changes to the product, I told her I would go look at it on the web, at which point she said she will send me the information and that I must let her know if I wanted it reactivated. I said it's fine, she can send me the information, but confirmed more than once that I will not be billed for it. Turns out that by sending me the information, she did reactive the service. I have called twice to have it cancelled, and have paid for the service for 2 months, and it still has not been cancelled. I want this service cancelled and reimbursed for the 2 instalments charged despite me not having authorised reactivation of the service.