Telkom *****s our money

I have cancelled my ADSL line for my business in June 2016! It is August 2018 and after what feels like a trillion emails and telephone calls, no response... I am still being billed for the ADSL line, even though it has not been used for over 2 years now! And I am forced to pay for it, seeing that it is billed together with my telephone line... which if I don't pay will be cut off! This is close to R6500/R7000 that Telkom owes us! I have been to the Telkom shops, but they just keep insisting that they cannot help me. I have even received an email from Telkom about 2 months ago stating that my ADSL line has been cancelled, but it still appears on my account and still no refund! What more can I do?? This is crazy...