Recycling Technologies interview questions

Interview process was well coordinated and I got a reply within the timescale the company gave me. They showed me/us the showcase plant as well to give us an idea of the work we would be doing i.e. no sugar coating.

Very disappointed with them at the end of the interview the HR said she will give me feedback at the end of the week even if i was not accepted, however she did not contact me and i have tried reaching her but she would not reply back to me. This was my first ever professional interview and it made me feel very depressed. The interview was with 3 people: HR and 2 researchers, i also tried contacting them for over a month but no reply until finally one of them replied apologising after over 2 months.