You will never contact the recruiter via emails or phone calls successfully unless he wants to contact you. The recruiter never sends emails to schedule an interview or inform next round interview, but a quick phone call which is unprofessional and informal. He won't discuss your available time slots for an interview but throws the interview invitation directly to you never confirming with you. Also, the recruiter is like a ghost, never reply emails or responds to phone calls for following up interview feedback, so you will never receive an "official" reject letter. ZT Systems, you should better train your recruiters well for using email to contact candidates and respond to decisions whether it's accepting or rejecting.