I received a call from this number and I have no idea what they want and wo they are. When I try to call back it rings busy. They have already called twice today. I am just wondering what they want

I came home to this call on my Call ID.  Call took place about 11:20 AM and caller hung up on my answering machine.

I received a call today.  There was talk about my bank.  I think they wanted info on my acct, but when I told them I did not give out personal info over the phone, they hung up on me.  Pretty sure it's a scam.