Telkom: Get out of my life! Absolutely the worst service provider in SA

I want TELKOM out of my life. For close to a year I have been trying to get rid of them after cancelling my contract but the bills just keep coming. They even threatened me if I do not pay but they did not deliver despite my pleas. See below:

Dear Telkom Customer. Payment for your mobile service is overdue and will result in an interruption of your service, credit bureau listing and collection by attorneys. Please make payment using reference: ********** ********** 25030 for R 1189.78, alternatively refer to https://apps.telkom.co.za/alpha/public/register for Online Payments and ensure quicker restorations. Ignore SMS if you have paid. Thanks. Sent from my iPhone