Billed for services cancelled

I have requested for Telkom Internet and ADSL services to be cancelled since 4 Apr 2017. All the required documentation was completed and sent to Telkom. We've also gone to the Telkom branch in Marshalltown on several occasions and each time we are told by a different consultant that the cancellation forms are not completed correctly and the process has to be restarted. One would've hoped that by the 100th time they would've gotten it right. Extremely frustrating dealing with Telkom. They cant render services and when you try finding alternatives they make it impossible to cancel with them.