Is this a legit agency? It does not seem to be.  

Here are all the same ladies in Denver: http://www.denverbabes.com/denver-escorts/

Wow.  That's good investigative work!   So it's bait and switch or le?

It's not clear. All the listed phone numbers are out of service and the only other way to get in contact with the agency is sending an email or submitting information via the online form. I submitted very little information to the online form but haven't gotten any response as yet.