Cancelled line 3 months ago- receiving threats

Sent through cancellation documentation on 9 Decrmber 2015 for cancellation effective 31 January 2016. Received confirmation of receipt on 9 December 2015. Forwarded documentation on 12 January and again on 1 February when a call to Telkom revealed line had not been cancelled as instructed. <br> <br> Received a message from Nossie da Costa on 17 March 2016 for an account not outstanding based on above timeous notice of cancellation given. <br> Upon receiving forwarded emails as discussed above, Nossie confirmed via email that she has attached copies of my emails and logged a dispute on the system.<br> On 22 March 2016 yet another threat was received from telkom with still no reversal of incorrect charges allocated.