"Employers hiring collections specialists are looking for candidates who can excel in a fast-paced administrative environment. Ideal applicants will have excellent communication and customer service skills, a firm and persistent attitude, and pay close attention to detail. In an interview, be ready to discuss your knowledge of accounting, ability to handle irate debtors, and any previous work experience in collections."
How would you get in contact with someone who doesn't answer the phone and has no voicemail?
Call employer. If unemployed, family members.