Called around 8pm last night... I said Hello 3x, but no answer so I hung up.

I called the number back and it is a World Vision hotline. They were calling to thank me for supporting a foster child and to inform me of a need for more sponsors for kids in Bolivia.

Could hear a room full of activity but caller hung up after a few seconds without saying anything.  I suspect they were phishing for active numbers.
They won't bother me again as the number is blocked.

Could hear a room full of activity but caller hung up after a few seconds without saying anything.  I suspect they were phishing for active numbers.They won't bother me again as the number is blocked.

Has been calling me few times and ask for my name

Called and did not leave a message