Wrongfully blacklisted by Telkom

-I had filled out the cancellation papers to cancel an ADSL line when I moved TWO years ago. As my account was settled, I confirmed with the call agent that I no longer owed Telkom any money, and the service would be cancelled. -Months after moving out, I receive a statement for money owed to Telkom. After going back and forth for months with Telkom, I eventually settled the account (of which I did not believe I was responsible for, but could no longer take the harassment from debt collectors. -In January 2018, I was contacted by Telkom who apologied and said that I did in fact actually not owe them that money, to which I received a refund, as well as a statement saying I no longer owe them a cent. -In March I find out from the bank that I do not qualify for credit because I have been blacklisted by Telkom for an account in arrears. (Two months after Telkom have paid me back and said I no longer owe anything!) -I then received a letter from the Credit Delisting Department on 16 March 2018 to state that the blacklisting will be reversed in seven working days. One month later, and the blacklisting has still not been reversed. -On top of the shocking service, I cannot get hold of anyone at Telkom to assist me in sorting this out. I have tried every avenue, Facebook Messenger, emails, calls. Not ONE person at Telkom can help in to sort out a mess that they created.