Recycling Technologies R D Scientist interview questions

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.