I have applied for admissions in a Ph.D program in Mathematics. It's a small department at a public university.
Some time ago, I inquired the graduate chair about my application status (he/she was the preferred adviser I've put down on the application) and was told a decision was not yet made. Furthermore, I was asked to attend an interview session, so I agreed.
However, the professor never made contact at the scheduled interview time, nor did he/she reply to my follow-up email (singular).
What should I do next? I found myself in a difficult position.