Who called from 8647218007

Called my cell phone, didn't recognize the number so hit decline call.  Immediately rang again from same number, declined again.  Immediately rang again, same process for FIVE separate calls before I could block the number.

one ring I didn't answer.

Rang once they hubg up before I could answer, had the phone in my hand at the moment.

Rang twice and then hung up. Seems to be happening 2-3 times a week. I have never been able to pick it up before it stops ringing

1 ring didn't answer. Recalled number no ring.