Who called from 6466637943

Same here.  Nuisance call, no answer.

They hang up and when I call back, the line is blank.

I received a call from the above phone number. There was nothing on the ID caller to tell me who was calling. I did not answer the call. They did not leave a message.

They called my cell phone and didn't leave a message. I called them back and went straight to some automated message saying i've won a $100 rebate program. Blocked the number.

Received a call from this number 20 mins ago. Didn't answer. Checked the internet and blocked it after reports like those above!