Randstad Recruiting interview questions

Came in for initial interview after being contacted by a recruiter for Randstad. First interview was basic questions over the phone followed by in person interview at the office which also went over pretty generic interview questions. I then was invited back for a job shadow. Everything went well and was told at the end I would be contacted by the manager or recruiter that reached out to me about next steps. I sent thank you emails and never got a response. I never heard back from anyone. I messaged the recruiter on LinkedIn after never hearing back and he still to this day had not returned my message. Extremely unprofessional! Especially when their business is recruiting!