Telkom Blacklisted me for Canceling my account

Tried to cancel my account. Every cancelation option tried by me failed. Emails, Online, in store etc. I paid for an extra 3 months of service I didn't get while trying to cancel and then stopped paying. Months later I get contacted by Telkom's Lawyers for payment, I explain the story, they ask for proof which I email them and I hear nothing more. Last week I try to purchase a vehicle and get told I am blacklisted due to non-payment for Telkom, I call said Lawyers and they inform me (VIA EMAIL) that they received my cancelation details and they informed Telkom that my account was canceled. And yet Telkom still blacklisted me for R6000. My Credit Score is ruined and my vehicle purchase has fallen through. Absolutely Disgusting, Every webpage or news site I look up is full of people with the same issues. What now Telkom?