Telkom - 7 months later after cancellation still recieving bill.....

On 15 August 2017 I submitted documentation to cancel our residential line as we no longer needed it due to immigration. To date, 20 April 2018 I am still receiving bills for the line that was supposed to be cancelled. It has been seven months. I have resent all documentation on numerous occasions and still nothing has been done. I get no reply to emails and absolutely no assistance at all. Can someone please help me cancel this account!!!!