Telkom refused to cancel then messed up my credit record!

I had the same Telkom cancellation issue where they didn't cancel my account even though I did everything by the book.

I requested cancellation (have proof) -> They didn't cancel -> I refused to pay because it was meant to be canceled -> They kept charging me -> They then wouldn't cancel because account was in arrears -> I eventually give up and paid R1000s to settle account and finally cancel it.

I checked my credit record yesterday and now I see that they gave me a very bad rating for the months after I requested cancellation!

I'm going to try get it resolved over the next week. If I don't come right then I'm going to write to National Consumer Commission