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Search the forum for ' good will letter' and 'navient'. Those that have had success with good will letters have some times sent many dozens out to various contacts in the creditor they are sending to. I don't know how successful people have been with Navient. However, rarely does a good will letter work on the first one sent.
The Higher Education Act places mandatory requirements upon reporting of delinquencies on federal student loans.
If it is a federally insured or guaranteed student loan, they will not grant a GW deletion.