Survey is immaterial in proving ownership over a land covered by Torrens Title

Dear PAO,

I have a dispute with Juan regarding a certain land. He claimed that he was recovering the land of his father, which is covered by a title, and that includes a portion of my farmland. I presented my Torrens title to him to prove that the land was mine, but Juan claimed that I needed a survey plan/map to prove ownership over the land he was also claiming. Please guide me on the matter.