The Fair Debt Collection Practices Act is the federal law that dictates how and when a debt collector may contact you. A debt collector may not call you before 8 a.m., after 9 p.m., or at work if the collector knows that your employer doesn't approve of the calls. Collectors may not harass you, make false statements, or use unfair practices when they try to collect a debt. Debt collectors must honor a written request from you to stop further contact.