LinkedIn Sales Operations & Strategy, Associate interview questions

1st contact: a contact introduced me to someone in HR, who I personally meet, and he kindly assessed the role more ad hoc for my profile, and introduced me via e-mail to the related recruiter. 3 days later: -1st. interview: by phone, HR asked some questions on my experience (30 mins). 7 days later: -2nd interview: by phone, the potential manager asked behavioral questions and concrete examples from my job experience (45 mins). 2 months later (once they confirmed that the position was open). -3rd. interview: I went to Dublin and had an interview with an analyst, the manager, and the head of sales operations. The technical part (excel) could not be properly done as the computer they gave me didn't work, so I had to explain the formulas to use and the way I would manipulate the data. This 3rd. interview was very well organised by HR in terms of indicating me the agenda's details and arranging the flights & taxis, even though that the time window between the flight's arrival/departure flights was really short. Until here, everything seemed to be ok... but I did not receive any follow-up message. Until I sent the 3rd message (more than 3 weeks after flying to Dublin) HR e-mailed me back informing me I was not selected as they found someone more experienced, and inviting me to keep in touch for other opportunities and to give them a call for more feedback details. I tried calling them, but my HR contact was not reachable... The fact that I had to insist so much for an update was discouraging.