hhanz10 (A/The) person who I (didn't/don't) know called on me. The indefinite article "a" is correct. In order to use "the," the person would have needed to be mentioned in prior context as an unknown person.
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hhanz10(A/The) person who I (didn't/don't) know called on me.The indefinite article "a" is correct.
Terryxpress whether you know or don't know the person relates to the time of when he called, and so must also be in the Past Tense.I've never been able to understand this point of view.