Telkom still double charging for a cancelled line

This is a further complaint regarding my complaint on 8th of March. At the end of November 2015, I requested a transfer of my line to my new residence and the Telkom operator advised that the existing line would be cancelled and transferred. Now 4 months later I continue to be billed for a line which was supposed to be cancelled. I even sent in a further formal cancellation of the line!! I will only be paying for my current line and all overcharges are to be credited for this line. I have had terrible service from Telkom and one of your call center operators even put the phone down on me! Resolve this immediate or I will proceed with further legal action and a consumer complaint against Telkom.