American Agencies Very unnerving Torrance California

Identified themselves as American Agencies, a debt collector. Person was obviously a foreigner as he was difficult to understand. Called on our work phone (company owned and issued) - a number we've had for only a year or so and is used only for work. Provided a valid social security number. Claimed to be attempting to collect a debt for AT&T incurred in June 1999 for a landline phone - provided a street address but couldn't tell me what city it was in. Our credit score is currently 800 - no outstanding debt. We did not incur this debt & I told them that someone would be back in touch after we contacted local law enforcement. Asked why we had not been informed of the debt previously and why it never showed up on our credit reports as we have purchased cars, trailers, etc in the past ten years as well as cell phones. Got no response to questioning. Was told that they would discount the debt dramatically if I would pay it with a debit card immediately. I refused and said I was contacting police. They offered to discount it EVEN MORE if I would pay IMMEDIATELY with a debit card and said that if I didn't, their collections actions would escalate. I refused again and said I needed a copy of the phone bill in question to give police. Who are these people? How did they get our work phone number and more importantly, the social security number? And how could we have a 10 year old debt to AT&T that doesn't show up on our credit???

Sherri
Lubbock, Texas
U.S.A.