Frenchy it might help to have a few more details. First off, how long were you there the first day? How long from the time you left until you got back in touch with Atlantic Group?
You'll find out that this is a detail oriented industry for obvious reasons. The recruiter knows this & is probably looking on your leaving so suddenly as you not paying attention to detail. That's probably a big reason behind him not returning your calls. I'm not trying to beat you up, just make you aware of how what you did might be perceived. You might keep trying to get in touch with your recruiter. You might also try with Bartlett & see if you can get on as a deconner. I wish you luck.