Maxon Computer Senior Software Engineer interview questions

1st Interview with HR, easy going but they tried to make excuses about my salary requirements. ie: "oh yes it's senior but we have different variations of Senior" Just a way to justify lower salary! Got a 2nd interview, the Senior guy was nice, interview was good, a few technical questions but nothing too intensive. I let the interviewer know I was not available for approx 1 week if I were to progress to the 3rd round, he was ok with that. I received an invite for a 3rd interview, technical with 2 software engineers. The email read something like: "We enjoyed getting to know you and appreciate your dedication to our process. We are impressed by your expertise and are excited to continue the conversation with you." The 3rd interview was requested for about 2 days later, i replied informing HR that I would not be available for around 6 days, as mentioned to the previous interviewer. That was cool with them but for some reason they scheduled it for 2 weeks following. So we arrive at the 3rd interview day, I had rearranged my day, got up earlier and did some preparation. Around 2 hours before the scheduled time I send HR an email kindly asking how long I can expect this to go for as it was never mentioned. 35 minutes before the start tile I get a response informing me that the interview is cancelled and they they rushed to go with another candidate, (they knew the position was filled at least 1 week before my interview date). What the heck, how mega unprofessional but all in all it was for the best. Imaging what nonsense I would have had to put up with if i ended up there! Advice, you are better elsewhere!