"Hi. I am calling from American Central Air and I am calling to schedule your appointment for your furnace. If you please give call me back at 703-960-3413. Thank you."

Google search of 703-960-3413 turns up:

Global Air Mechanical Inc
5850 Cameron Run Ter,
Alexandria, VA 22303

Google Maps shows this to be an apartment complex.

Heavy Female Indian Accent. Sounded live, not pre-recorded. Called my personal office number, which was captured by my work voice mail.

Caller ID was "Cell Phone   DC". Note the multiple spaces.