I've noticed a few similar posts about contacting companies after an interview asking for progress however i'm very much of the opinion that if they do not contact you they are no longer interested.
However my instance feels somewhat different, I applied for a position they were advertising and I didn't hear anything back for a month. I had, in this time, assumed they weren't interested. However I got an email requesting a call, with an apology, for the delay which was due to annual leave and busy workload on her return for the hiring officer. They seemed very keen to get me an interview with their boss, but said that he's not always in the office that I would be going to & he is very busy.
After about 2 weeks from the original call, I sent the hiring officer an email asking if I should be expecting something soon or if the interest was dropped, which is fine if so. However she said he is just very busy and that I should hear something soon. Another 2 weeks has passed since this conversation.
I'm not in any rush to change jobs, so it's not like I'm desperate to hear back, I just wondered the opinion to contact again? It feels to me like they are being very unprofessional, especially considering it's a big company and a position they advertised for.