Hi. By line removed i would think you mean disconnect service.... Call Optus and disconnect. Maybe you mean physically removed?...in that case hire a data/telco contractor to remove physical wires.
Apologies for the delay in response @zorro5. Sorry to advise we are not a Live Chat service and we are experiencing a high volume of enquiries so may take some time responding. You can always jump on Live Chat if you need immediate assistance. Have you already spoken to someone in this regards since posting? Check out this article on more information about Cable installation & removal. Let us know if you have any further questions. Kartik