Calls constantly; never leaves a message, and the one time I answered, simply dead air.

called me. left no message.

SCAM ALERT 217-978-4049 Received a a anonymous call- Under surveillance by FBI

The caller hung up on my answering machine.  I called the number back and got a recording stating that I had reached the reservations department.  No company name, no other form of identification.  I get calls from random numbers on a daily basis and when I call back, the same recorded message plays.  Most likely a spoof number scammer that needs to be caught and apprehended.