Merchants' Credit Guide ripoff NEVER USED THIS FINANCE COMPANY THAT THEY CLAIM I OWE CHICAGO Illinois

I received a letter from a collection agency (MCG) saying they were representing Pinnacle Credit Services (who had purchased my defaulted account from Household Finance ) I have never had an account thru HFC . When I called the number listed all I received was a constant "hold be right with you" or "leave a message ".
AND Ken Hughes is the name of the CA rep.on this letter. Offered are 3 ways of repayment (1) 1 time payment of 50% owed (2)3=consq. pymts for 70% total owed OR(3) monthly payments I can afford until paid in full for full amount.

I am trying to contact the original debt I supposively owe to inform them of this matter and hoping it is not an identity fraud situation.

Merchants' Credit Guide CO. (incorporated 1899)
Member of the American Collectors Association
there are 2 addresses on this letter PO BOX 802 OAKS PA 19456 and 223 W.Jackson BLVD Chicago IL 60606

Pam
Lexington Park, Maryland
U.S.A.