You said Navient. That name alone means stay away from their calls. Any calls from them deserve to be blocked and will eventually eliminate their means of contacting you. The number IS linked to Navient.
Scam alert! These guys claim to be from Navient and that they have a plan to set up for delinquent borrowers. When I ask why my payments aren't being updated on the website, they tell me I have a qualifying period of 3 months. They've also tried to raise my payments to what seems like arbitrary amounts without contacting me, and have always refused a reason.
You said Navient. That name alone means stay away from their calls. Any calls from them deserve to be blocked and will eventually eliminate their means of contacting you. The number IS linked to Navient.