Arguing after being proven wrong

I'm curious.

What would YOU reply to a person who said something that's based on misinformation or hearsay and supposed personal expertise~. You then correct that person with FACTUAL evidence. Yet they still keep arguing their version of reality (or delusion, tbh).

CONTEXT:
(This is about art. A supposed part of the art was planned after a mistake was made, yet in an interview you can hear them talking about planning out the exact scene as is in the final. Even a staff working on the artwork has confirmed that fact.)

What would YOUR response be after previously staying nice and calm and factual?

Anything goes; meme posts, reply pics, serious answers, etc.. I'm just bored af, so gimme anything you got.