Telkom are ****** and won’t cancel my line

I am finding it to be impossible to cancel my Telkom line. I tried online and that would have been successful except the Telkom representative said that my ISP had not released the DSL portion of the line. I have proof that they did. Any attempts to try again online have been unsuccessful as the Telkom website gives me an error to say I already have a cancellation request pending. So I’ve tried the email route, but all emails to ********** are bouncing. I just want to end this persistent R200 I am being billed for a service I never use! I unplugged my telephone about a year ago and was using only DSL, yet Telkom bill for an unused voice line. ******** activity, I believe.