Telkom cancellation

In January 2017 I cancelled my Telkom account by sending through a cancellation form. For months after they kept rebeting my account so I kept telling my bank to reverse the debit order and block Telkom from debiting from my account.

Needless to say Telkom kept calling me for the money even after I sent numerous mails to Telkom managers, consultants and direct to their support mail address. This is excluding the hundreds of phone calls I made to them complaining about their shopping service!

They then sent some debt company after me and I sent them the mail trail and things went quiet after that.

Now in December they decided to send some other company after me called "Nudebt" who are threatening to mess up my credit score if I don't pay the "outstanding" Telkom account.

Please can someone help me sort this out as it's been a horrible experience and I'm sick and tired of Telkom acting like I owe them money! This has happened to a couple of people I know.