Who called from 6412438358

Called my Google Voice #. Sent to VM. A single 'beep' was recorded on the message that otherwise had 7 seconds of silence.

Called my Google Voice # again. For some reason I took this call.
Offering entry into a $25K giveaway.
The 'person' on the other end sounded recorded. Even when I asked for clarification of what they were calling for, the delay in response and the response itself just seemed recorded.
Had to answer questions by pressing buttons on phone. Wouldn't accept my keypresses. I suspect it had something to do with going through Google Voice?
I hung up. Not worth it.
Then added the number to my Call Block list.

Called my Google Voice #. Sent to VM. Had 6 seconds of silence.

Received a call, no message left and when I called back received message that the number is not assigned yet.  I would say this is a scam

I got a call from +1 641-243-8252