Worst customer serivce ever

This is my 2nd complaint against Telkom. The 1st time they could not handle the simple task of updating my new bank details on their system in order for my debit order to go off. Ended in them handing my account over to debt collectors in error even though I have been making cash payments for the months there were no debit deductions. Somebody handling the complaint contacted me and assured me that everything was sorted and the debit order deduction will start as of the next month......almost 5 months later and still nothing. I'm still paying via EFT's. I cancelled my contract (middle August) by going in to the Telkom Mobile shop in N1 City. I filled in the cancellation document and provided a copy of my Id as requested. The lady informed me that I will need to make one last payment on my account, because they need 30 days to stop everything. That was middle August. I made a payment on 01/09/2015 and that was supposed to be the last payment. Then I received another invoice and again made a payment on 01/10/2015.Today I received ANOTHER invoice and I am sorry, but I will NOT PAY ANOTHER CENT. TELKOM NEEDS TO CANCEL MY CONTRACT WITH IMMEDIATE EFFECT.