Debt collectors

Good day, <br> I Cancelled my Telkom account last year August 2014 and then they told me that the last payment will go off September 2014 as I have to give a month notice, they took off the debit order from my account September after last payment was made. They started phoning me about two moths after that stating that the account is still active and I told them I cancelled it and they said they will check and the they never contacted me back and so it went on every two too three months now they handed me over to debt collecters and each time they also state they will sort it out with Telkom and then someone else just phones me the next month, does no one keep record?