Armacell interview questions

I was invited to interview on phone with recruiter in NC USA. Last minute they changed the time (no problem it may happen). The next day they sent an email and said They are reviewing and they will get in touch. Radio silence. In the meanwhile they posted the job again with mild changes in definition and topics. I sent a follow-up email. No answer for 3 weeks more and I gave up. It is one of those experiences you don't expect from Armacell and WAM and Global Level Management. I liked the company profile and the job and I believe I was a good fit but I am cold now.