Same thing about to me a few minutes ago, and twice tonight

I answered earlier tonight and no one would answer me ... an hour later they called and I did not answer, but they also did not leave a message.  Does anyone know who owns this number?  The display said Unknown Caller.

Recorded message from a research company

Hope they stop calling me and no answer disturbing,,,

received call from this number twice tonight. Answered and no one was there.

Yup, on call display twice last night. Guess I didn't win that prize!