Telkom makes me pay for their error

<p> On 21 February 2017 I emailed the cancellation form as well as the requested identity document to the Telkom email address provided on the cancellation form.</p> <p>The form advises that it will take 21 days for the cancellation to take place. On 21 March I phoned then to find out that nothing had taken place yet and they could only escalate the request after 30 days. At the end of March I phoned once again only to be told that no cancellation had taken place. I then asked to speak to someone who could correct the error and cancel my line and was told that all the supervisors were busy. The call center agent then reassured me that she would sort out the problem and get back to me that day or early the next. She asked me to email proof of when I sent the cancellation form. When nothing was done I reversed the charge and blocked them on my bank account. </p> <p>Meanwhile Telkom had debited my account and actually took more than the agreed amount. When after a week I still had not heard from them I phoned again. I was then asked to email my request again and they would try to sort it out. This was now the third time that I was emailing the documents. I had spent over 2 hours of my my airtime and work time. </p> <p>It was now mid April and still nothing had been done I received another invoice from Telkom billing me into May. So I went to social media and wrote a letter on the Telkom page they then took seven days to correct the problem and I've now told me that I need to pay the outstanding amount because the line was still used. I have tried explaining that if they had canceled the line when I asked it would not have been used.</p> <p>I now don't know what to do their service is shocking I had to phone multiple times and nothing was done only when I complained on Facebook did I get actual responses and it still took over a week before the line was canceled. They are now demanding their money for the usage of the line for even the days after I had canceled it please can someone advise how I deal with this </p>