Complaint Review: ACS-Debt Collector

I been getting voicemails from a guy name Alex Stoneham who has an accent. He was informing that their were legal actions being taken out on me for non payment of a loan that I received. I called the number back that he had left (347-709-3360) a guy (with an accent) named Denise answered. He informed me first that he was having a bad day so I should listen to what he has to say. He told me that I had a loan from a company but would not give me the company name or a number. I asked to speak to his supervisor and he told me that his superbvisor doesn't want to talk me. He started yelling and telling to pay my debts and stop being lazy then he hung up. I called back asked to speak to the manager and he hung up.