Recently, we have been getting calls from these Los Angeles phone numbers: -9949, -9946, -9947, -9948.  They must be related.  We never pick up un-recognized phone numbers.  Strangely only -9948 has left a vm.  There was a beep sound and then a robo voice saying, "goodbye".

-9949 5/19
-9948 5/19
-9946 5/18
-9949 5/18
-9949 5/16
-9947 5/15
-9947 5/11