They call and don't leave a message or anything!  How rude!

I could hear a TV in the background. They said nothing, then hung up. The caller ID said Southland Exter. These b*****ds have nothing better to do than hang up on people all day. Jerks!

I answered, heard heavy breath, said hello, caller hung up.

Showed up on caller ID.  When I called back, it rang without a voicemail or answering service.  Any ideas?