I've posted about this before but it's a new woman's name and a new number... same spiel.
"Yes, uh, this is Lori Robins and I'm calling in reference to your, federal student loan, um, I need to discuss your repayment options with some new changes that have just recently taken effect. So, if you could please give me a call back at 866-353-2882 with this reference number; that will be very helpful if you have that handy when you call back. It's 02026. Thank you."
Do not call 'her' back. It's not legit. Erase, ignore and block.