Metrohm USA interview questions

Several interviews by phone and video conference. Phone screening, followed by two video interviews. Fairly time consuming. Easy going interviews. They screen you thoroughly to try to make sure it will be a good fit. After the third interview they promised a 4th and went silent on me before sending a rejection email months later. I took lots of time off for work and don't appreciate the lack of communication regarding what really happened. Management was changing during this process and I think they may have just started the process from scratch after I had already committed a lot of time and effort to the process. I received no response to follow up emails when trying to find out what happened. Also received an email for a phone screen from a new person and asked if it was a follow up. I received no response to that either. Feel as if they owe me an apology, but maybe I dodged a bullet.