Wacker Laboratory Manager interview questions

I applied online and HR reached out via email for a 30 min phone screen. Following the HR, I had one hour call interview with the hiring manager. One week after this call, I went on site and met with the entire team, managers and junior level employees. There were about 7-8 people in total. At the end of the session, I was told they will schedule another interview session, with two managers that were absent for the day. I waited for 2 weeks and decided to follow up with HR and ask about the next steps in the process. It has been months and I still did not hear back. Overall, the entire process was a complete waste of my time, with very primitive interviewing processes and totally unprofessional HR, that failed to represent the company in a respectable manner.