Telkom billing for cancelled accounts.

Telkom's charges you even after cancellation and noone seems to have any answers and you get bounced from pillar to post.I had a Mobile Data account with Telkom which expired and then went onto a month by month period at end of term. A month before expiry I was offered to upgrade to Fibre for the home by an agent which I took up as it was a better deal and asked that my Mobile account be cancelled. A month later I got a charge and told it wasn't cancelled , then re-cancelled again with the assistance of an agent. Then I thought it had been cancelled only to find that Telkom has now, 6 months later, handed over my account for non payment. How many times must I cancel the same account. My Fibre to the home account is working well but I'm thinking to cancel everything that is Telkom related. Every-time I call the call centre I get different numbers to call and no-one wants to help