I had an interview with the head of a department a couple of weeks ago. This interview was arranged by a recruiter. The interviewer is located in Brazil, and I am in Argentina.
Because of communications problems (very common in my country) we had to reschedule the interview and we did so via SMS texts and WhatsApp. Now it has been two weeks and I do not have any update. Would it be unprofessional to send the interviewer a SMS or WhatsApp asking for an update? I do not have the interviewer's email, and a phone call is too expensive for me.