Your situation is not at all clear to me. My guess is that when the first student loan company sold the loan to the second one some payments didn't get applied timely to the account or were misapplied. That’s not all that uncommon. Do you have a record of the payments (e.g. copies of canceled checks, transcripts of the loan accounts, etc)? If you do, then you should be able to show the second lender that everything is, in fact, current and cure whatever trouble you are having concerning the loan now.