I just got a call from this number and it is a  real person telling me I just won a Walmart and Target gift card.  And  she  quickly directed me to a robo survey. The survey was about medical issues. Sure would have liked to get a gift card, but hung up. because I knew it was a scam.,

call number back and no answer

You returned a call to a scammer, so you could be scammed?? Call them back tomorrow, and maybe they will answer and accept your volunteering to be scammed.

Keeps calling even unknown