않았다고요

didn't ... (I'm telling you)

→ 않다
않 not (forms a negation after -지) + 았 Past tense + 다고 Indirect quotation + 요 Polite speech
auxiliary · informal, past tense Rare #30,479
didn't ... (I'm telling you) Used to insist that something did not happen or was not the case; it refers back to a preceding negative verb or adjective.
KO: 저는 그 사람을 만나지 않았다고요.
EN: I didn't meet that person, I'm telling you.
Conjugation of 않다

다른 건 중요하지 않았다고요

I said nothing else mattered.

— 잉글리쉬 페이션트 (1996)

난 죽지 않았다고요!

I'm not dead!

— 컴 앤 씨 (1985)

늦지 않았다고요

I said I’m not late.

— 엠 (1931)