I need A subpoena For a call tracing!!! What nonsense

I cancelled all my lines over 3 months ago, and only just have 1 line for 3 months with Telkom. To my surprise I received a bill on Monday which had the incorrect billing address. I immediately went into a Telkom branch and they said that it was changed on the 3 August they could not say who authorised the change. I told them that I am the account holder and I certainly did not give them permission to change it back as I do not have that company anymore and certainly have no need for all those numbers.I then called Telkom contact centre and spoke to a Lady called Calanthia Pea**** who was not very helpful. I explain to her that after I cancelled and only kept the 1 line my billing has been correct for the last 3 months. Explained to her that a customer rep at the store advised that it has been changed. I asked her if she is able to see who gave authorisation for change. She could not answer. I then asked her that I am requesting a call tracing gave her the number as I want to escalate. She put me on hold and got back awhile later , stating her words if you are wanting call tracing we will need a subpoena from the courts. Telkom this is nonsense I will be taking this matter further. As I gave no one permission to reactivate lines.