The first call came in late April. Megan Duffy, a 21-year-old college student, picked up the phone at her parents' home in Belmar, N.J., and heard the voice of a debt collector.

The first call came in late April. Megan Duffy, a 21-year-old college student, picked up the phone at her parents' home in Belmar, N.J., and heard the voice of a debt collector.