Person called twice, left one voicemail.  Just listened to it, and it's a women speaking Spanish.  Not a clue what she was saying, but it did kind of sound rehearsed/recorded.

I just received from this number on my cell phone!!! Someone speaking spanish, sounded like a recorded message.

Ignored. No voicemail.

Ghost call.....probably telemarketing....  I feel sorry for these folks....

The caller, 1-720-504-6034, it used  this number twice as ID, called us @19:39,09/25/2014 . We did not answer. When I returned the call without showing number. I heard there is a rapid message. Then I was cut off. Probably
asked me to do some thing.  according people reported to www.800notes.com. this number was used to call people randomly 09/11/2014.)
Caller: 1-720-504-6034 ( From: Denver, CO.? ) I received from Denver, CO., few time in the past.