Man named "Eric" has been calling my unlisted/unidentified cell phone and leaving a message insisting that I need to call him immediately concerning a "file" he has in his office. His phone number never identifies any company. He also never identifies the purpose of the call pursuant the requirements of the Fair Debt. Collection Practices Act as required of debt collectors i.e., that the call is an attempt to collect a debt. I recently answered my phone where "Eric" finally identified himself as an agent with ARS National Services, Inc. who claims to be collecting a debt owed to CitiBank. He immediately started yelling at me asking me if I was going to pay the debt or not. When I told him I was in conference with other people 9who could hear him screaming over the phone) and to please allow me to call him back or to call me back the next day, he said he would accept that as my answer to not pay the debt and he would inform CitiBank. When I tried to call him back when I had some privacy, no one answered the phone. The following morning he called again an left a message saying if I was prepared to settle the debt he was authorized to settle at a substantial discount. He coersively advised me to call him back a.s.a.p. or the offer would expire and he would take legal action against me. I do not believe his is in compliance with fair debt collection practices.