"didn't not" is not grammatically correct and should not be used in written English.
It is a double negative, which means it creates a contradictory meaning and can be confusing for the reader. Example of incorrect use: "I didn't not have any money to buy lunch." Example of correct use: "I didn't have any money to buy lunch."
Exact(57)
He didn't, not then.
I didn't not ___.
"I didn't not hear that question.
No it didn't, not to him.
We didn't not respect him.
And he didn't, not really.
You know, you didn't not vote..
Thankfully, no it didn't, not even close.
Similar(3)
The end did not, not exactly.
Well, no it doesn't, not quite.
So they don't, not anymore.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com