Expected to pay for no-service

I have had intermittent problems with my line for the whole of 2017, in particular from the 18 April 2017, (reference number 508CNZ060417) where the ADSL line has been slow with repetitive disconnects and static on the line line. This fault was then closed by Telkom as "No fault found" when clearly there was a problem.

I then reopen the fault on the 8 June 2017, reference number 481CNZ080617 Then again on the 18 September 2017, reference number 197CNZ280817

Then canceled the line out of frustration and logged a billing dispute on the 29 December 2017.

I settled my account in April and made it very clear that I will not pay for anything from the 18 April onwards. Especially since I had to purchase a mobile router for around R2500, multiple and expensive data bundles.

However I received a phone call today that I am been handled over. How dare you expect me to pay for the pathetic service I have received over the last few months?