Who called from 3475281664

Calls often and when I call back it said the number is not in service.

Tried calling it back and it says that it is "incorrect number". Not sure what it is.

This number called me 9 hours ago, once I picked up there was no response and they hung up.

This number called me, left no message and I called it back but it was an incorrect number??

This number called me twice yesterday, and so did another number.  I didn't answer the first time, but the second time they hung up.  Okay???