Got this same call with message same as above.
"They left me a message. It was a woman who acted like she'd spoken to me before. She said "Sorry it has taken a little while for me to get back to you. It has been really busy here. As I look over your paperwork I think I can lower your interest rate to as low as 1.5% and cut those monthly payments down for you, get you out of debt sooner. It is pretty important that you call me back so I can get you started on that program. The number is 1-800-977-2091."