North Shore Agency-NMP Attempting to collect undue payment Columbus, Ohio

I received a bill from North Shore Agency stating that I had a delinquent bill from Better Homes and Garden that Had not been paid.  I haved not ordered from Better Homes and Garden in over two  years and paid for the books I had received.  I tried reaching the company without any luck...except their request for payment.  I do not owe this bill and refuse to pay it.  They do not referrence a date or anything as to when this purchase was made so I can't look up the payment and send it to them.  I don't know why Better Homes and Garden didn't at least send me one past due account bill...I don't know how to clear this up.