Who called from 3100234965

Gotten a few calls the ID reads name unavailable, or the letter V followed by 14 numbers.
Always same message.
Audible beep
Robotic voice(switches between male and female voice per call)
"Hello this is (poorly generated name), how are you?
... Are you there?
Then hangs up.

Didn't mean to put SMS.

No one there. Obviously not a real number. I tried calling back; was not too surprised that this number was spoofed ("this number is not in service").

Who is 310 023 4965

"Hello this is ??????.  How are you?"  I don't remember the name, but there is silence.  
I think the "robo" was waiting for a voice response.  I don't have any idea who or what this call is about, but it is annoying.