Phone log over 90 days

I am needing phone log/ records from over 90 days ago. I’ve reached out via chat and over the phone and no one seems to be able to help me with this. This is needed for a legal matter. It was extremely difficult to even get anyone on the line or to respond that understood what my request was. I don’t see why this isn’t an option online or why it’s not something that’s generated monthly and kept in a document section of our Xfinity mobile accounts. it should be available in archived after a year or something if it’s taking up too much space on Xfinity’s side.