I've been going through an interview process with a major technology company at an intermediate level software development position and up until recently, things have been going great. All of the interviews were challenging, but I made it through. Communication with the HR person who is in charge of my file, let's call her Rachel, was fast and concise. Most recently, I've been invited to conduct the final round of interviews, but no date was set.
However, after that invitation was extended to me, e-mails I sent to Rachel have been ignored, until eventually they started bouncing back. After calling the company and asking, it looked like she had left the company.
In addition to this, a new HR person (Mike) has reached out to me, inviting me to the first round of interviews, and for a junior level position! Mike replies to one e-mail for every 10 I send, saying unspecific things like "We should be contacting you by the end of next month".
As demotivated as I am, I need a way forward.
Is it appropriate for me to reach out to the people who interviewed me? What other actions can I take to mitigate my situation?