Data imports are a cool feature in CRM to import bulk data, do bulk edits in excel with re-import option and then re-import the changes.

Highlighted Account record names were added in error.

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Accidentally wrong import file was used, how to roll back now?

Just pick the option, All Records imported to the Entity during this import

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Then a bulk deletion job option will appear, what is cool is it can also delete the import job history:

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Once ok is clicked, it will trigger a background system job.

After some time, the imported records will be deleted.

Note: Changed column values will not be rolled back.

Hope it helps!