Telkom pay me my money

I wrote a poor review on Telkom about a year ago because I could not get my landline cancelled - despite completing and submitting the forms repeatedly. After a little under a year's frustration, I finally received notification that my old line would be cancelled and that I would be refunded the money that had been paid for the old line. I am still waiting to be refunded. I have phoned and made inquiries and have been able to make no progress. I cancelled the line effective November 2017, I received notification in August 2018 that the line was finally cancelled, how is it that I have still not been refunded the money? Telkom, this is disgusting customer service, you repeatedly cancelled a new service I have to force me to pay money that I did not owe you for a line I had cancelled and now you can't be bothered to refund it?