I was able to answer this number, and they say they are from a collection agency requesting $ about an old bank account.
For Security purposes, they wanted my Social Security Number, Address, and Birth date.
When I pushed back on the lady saying I don't know who you are, she told me to check out their website, which isn't enough proof for me that her company is for real and not some ID thieves.
So I told her to send me a letter, with a telephone number, and I will get back to them. Still isn’t proof, but maybe I‘ll get an address.
After I hung up, I went to the Caller ID and dialed them back. I got a "disconnected phone number" message. Not to reassuring.
I then immediately called my old back of +5 years and am waiting on to see if this is a valid collection or not. Of course its going to take a while to verify everything since the account was closed so long ago, and the addresses are from old college apartments. :(