I can't find this number listed for them but when I call this number back from a blocked phone the recording answers, Glass Mountain Capital. They're a collection agency with a nasty reputation for being dirty. There's a video about suing them on YouTube but I didn't watch it.
I have had my phone number for four years. If this caller is a collection agency, they have been cheated by the original lender who probably cannot contact the original borrower because they moved and changed their phone number..