In the movie "The Prestige" why didn't Tesla say that he never built a machine for Borden?

Angier went to Colorado springs to ask Tesla to make the machine he made for Borden, but as far as we know, Tesla never made a machine for Borden, so why didn't Tesla say to Angier that he never made a machine for Borden? Did he just pretend that he made the machine, so that he could get money from Angier or was it something I missed?

submitted by /u/Heisenberg_991
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source https://www.reddit.com/r/movies/comments/z8tls2/in_the_movie_the_prestige_why_didnt_tesla_say/