Navient Solutions, Inc. Student Loan Complaint

Navient Solutions, Inc. Student loan department,

Non-federal student loan Dealing with my lender or servicer Trouble with how payments are handled Georgia

- paid off our federal student loan than we were told we owe a loan to a private company Navient, we have tried to make arrangements to make payments but were told they would only accept the full amount yet they keep posting on our credit that every month were late with payment, damaging our credit is this legal for them to do this if not could you please look into this