Got a call from this number this morning. The did leave a message, however I have not ever had a student loan or a loan of any kind, in fact. The have called in the past but this is the first time they have left a message. So whether they are truly looking for me? Who can say, they didn't leave a message that contained the name of the person they are looking for.
NelNet student loans (both government subsidised and non-subsidised college loans) I think this is only NELNET and not a collection agency who works for NelNet.