Who called from 9798234073

Around 11:30 at night the phone rings and no one is there.  This has happened several times now.

Received call at 10 at night. When I answer I got a goodbye. I don't appreciate this!

Same here - a call at 10:54 pm - nothing, then a computer type voice "goodbye"

Same here.... 5 calls in the last two hours...no one there when we answer. I called the number and the automated message said that the number was disconnected.

Have received two calls from 979 823-4073 between 10:30 and 11:15 pm.  No one there on either call, but got an automated "goodbye" on the second call.  When I tried to call the number back to see who was calling at that hour, I received a message that the number was no longer in service.  How is someone able to use a number that's not in service unless they work for the telephone company?