Cancellation of Telkom line

Further to my initial complaint I have been informed by Telkom that the issue was to be escalated to the responsible person. A few days later some lady from Telkom phoned me and during the discussion it became clear that she did not understand my problem. I had cancelled all services with Telkom on the prescribed form but apparently the data line was not cancelled. Subsequently I have received another account for the data line, which I can`t use since my Telkom service has been terminated and I have moved from this residential property in question. What should I do now since Telkom neglected to cancel all services to my original line and I am not going to pay for there incompetence.