"Why did you not call me back in the past three days?"
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不 is used for the present and future.
If you still haven't spoken to the person and the situation is ongoing, you might leave this message by text or voicemail. "It's been three days, why aren't you returning my calls?"
That's how I understand it, but not sure if that's right.
"Did not call" is preterite and perfective, rather than perfect, which would be "have not called".
I don't like Duo's current English sentence ("Why did you not call me back in the past three days?"), and I think something along the lines of CinamonTe1's suggestion would be better, but perhaps it's impossible to come up with a perfect direct translation.