Telkom sucking me dry

We cancelled the account after 3 months of no service. Which was a nightmare on its own. Not only do they NOT actually support email (to cancel your account) AS STATED ON THEIR OWN FORMS. But, there's no telephonic or face-to-face way to cancel. BUT, for some reason you can buy online, on the phone, or face-to-face (it's almost as though their policy is more on finance than customer satisfaction). After all of the issues, I cancelled the account, but I'm now being hounded and threatened to pay them even though I'm not using their service or receiving anything