Cancell my telkom contract.

I did a cancellation request online (22 July) on the Telkom site as they require and I was promised a call within 7 days to finalise cancellation. No call, no feedback. I then completed a complaint form on their site as no one is getting back to me. Surprise, surprise, still no call or feedback. I took out a new internet contract from another company and is not willing to pay for two contracts.