Straumann Group Network Engineer interview questions

I had a first interview with Manager and the senior Network Engineer. they have tested me with soft skills and technical skills. i've being selectead for second round this when startead to behave unprofessionally the HR, she was contatctead me to book an appointment for second interview dates, i asked from her several times via mail how long they would need to mange the interviews and what to expect but she wasn't replied me. after 1 week of silent she replid me saying they have filled the role with another person and my candidature being rejectead but i realized up to date they are stil searching candidates to fill the role eventhough she replied me saying they have filled. i was very disappointed because i was in the phase to book a date for the interview and after a week reciving rejection mail. what a loose of time and unprofessional HR !!