Asking for personal info every time they call

These people have called before.  I thought they had gone away, but I guess not.  I do not answer numbers or people I don't know, so they get my answering machine and have never left a message.

These people Never respond to you once you tell them you had a call from their company. They immediately hang up without identifying the company they are representing.

Calls will not say who they are and when you ask, they hang up.

Called this number back from a private number. They were very uncomfortable when I asked the name of the company. She finally said something like Ufin. I asked her to spell it. She got very defensive. Tried to ask me for personal information and finally hung up on me when I said, "You called me so I get to ask the questions."