Call everyday and don't say anything, so I called back and they wouldn't give explanation as to why they are harassing my phone

Silence at first then a woman comes on asking for a "Gabriel". No Gabriel in my household. Calls every day at different times. Today I answered the phone and said "hello" 3-4 times and they hung up. Who the hell are these people???

Received a call 2 weeks ago. Stated they were a pre-litigation firm. They offered to help me with my over-due accounts. I gave them a try on a very old account. Not sure how, but they collected it with 5 days or so. I just got my check in the mail. I don't like phone solicitations but they made it worth my time.

As soon as I answered they hung up. I called the number back and when they picked up I got a tone like someone dialing out.

calls numerous times dailuy for a week.. There is no answer