Cancel account and still getting billed.

Hi I stopped this account in July 2014 and then in Sep 2014 I receive a bill of R79.40 I went to Telkom and they said that they did not cancel the Internet cable (bill canceled) then in Oct 2014 I received a bill of R80.25 and they said that they did not cancelled the line cable (bill canceled) then in Nov 2014 I received a bill of R241.00 and they wanted to give me over to the credit berow. I called head office and they looked on there system and found nothing and said that I am clear and now this month (March 2015 a year later after closing) I received a bill of R106.88. Don't know what to do, can you please assist me in this problem.