Who called from 8643639028

Called my cell @ 4 this afternoon; no msg., & we NEVER answer unfamiliar #s.

Came home and had 14 calls from this number with no message. When I called it, I got a recording that this number is incorrect and to please check it again. Don't know how that happened, I just hit talk on my phone and the number dialed by itself...Came up as a cell phone in South Carolina

I got 2 calls on my (unlisted) cell' 'phone from this number yesterday.  No message left.