Telkom unable to process a cancellation order for ADSL

I've been struggling for almost a year now to cancel my ADSL account with Telkom. Finally after months, and also complaining on Hello Peter, the line was finally disconnected, now you haunt me monthly for a bill I am not willing to pay due to the fact that I gave more than enough notice when I submitted my cancellation in the first place.

I am also charged R 43.52 a month because you think it's overdue.

This is ridiculous, how can we resolve it once and for all?