Can I say "It's not factual" or "It's not a fact" as a replay in instead of saying "It's not true"
Can I say "It's not factual" or "It's not a fact" as a replay in instead of saying "It's not true" Will it sound good?

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Answer

Yes you can. I prefer it’s not a fact over it’s not factual.

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Answer

Saying "that's not a fact" or "that isn't factual" sound a bit more natural to me. But it makes more sense to say this when talking about something like the news, science, or a crime rather than the reply to day to day conversation.

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