Impersonated and represented herself as XXXX XXXX XXXX XXXX XXXX. Threatened my work. Numerous harassing phone calls to my work. Will not stop. No debt validation letter by U. S. mail. No physical address. Said she was XXXX XXXX. Think it is National Asset Processing or XXXX XXXX XXXX XXXX. Also a XXXX XXXX. XXXX. XXXX.