Can't cancel a line

Need to cancel a redundant business ADSL line (switched to fibre). Completed and sent Telkom's cancellations form (41136) to the e-mail on their form - [Email Removed] - first time 28/10/2015 and again 4/11/2015 - both times received auto reply from Telkom to set my heart at ease that they received my mail and will be making contact. I followed up again today (sent the second time after following up and they confirmed they did not receive anything) and still they say they did not get anything. I get the number for cancellations department from CC operator ***), phone, does not exist. Phone CC again, get another number ***) - no answer, just rings and then cuts off (phoned numerous times). So what do I do now Telkom - ball is in your court?