Impossible to get through

I cancelled my ISP and my line with Telkom in March, which was a 3-hour ordeal on the phone. Since then I have still been getting bills although I no longer have any services provided to me by Telkom. I called them at 8am this morning and was transferred to three different departments where nobody wanted my cancellation reference number. At 11am (3 hours later) I finally spoke to someone in the Cancellation Department who said he could not hear me and hung up. They may rush to sign you up, but when you want to get out of your relationship with Telkom it becomes impossible.