Русско-англо-русский юридический словарь

A collection agency also known as a debt collector, is a business that pursues payments of debts owed by individuals or businesses. Most collection agencies operate as agents of creditors and collect debts for a fee or percentage of the total amount owed. (Wikipedia)

Collection agencies have four methods to collect a debt: letters, direct contact, reporting the debt to credit reporting bureaus and suing for the debt. (ehow.com)

Debt collection agencies collect delinquent debts of all types: credit card debt, medical debt, automobile loan debt, personal loan debt, business debt, student loan debt and even unpaid utility and cell phone bills. (Investopedia)