Capital Acquisition Management Company Said I owe a debt from 1989 which I know nothing about Rockford Illinois

I received a call just over a month ago saying I owed on a debt from 1989. They insisted they had an affidavit with my signature on it and that I should pay my debt. They say the total amount was for 1900.00 and some odd cents but they would settle it for 950.00. After reading some of the posts here, when they called last night, I asked for a faxed copy of this affidavit and proof of debt. The gentleman on the phone said if he were to send me this, I would not get the deal, that I would be liable for the full amount and now lawyer fees. Did I make a mistake????

Jon
princeton, Illinois
U.S.A.