Bloomberg interview questions

First I applied online, just posted my resume and the next day they fixed me up a phone interview to a 2 days later. The phone interview lasted for 30 minutes and at the end they scheduled a 1-1 interview in my country. 1-1 passed really well and the guy gave me positive signals about it. After a couple of weeks, HR invited me to an interview in London which lasted till15.30. First I spent time with Analytics team, then Sales Team. After that I made a 1-1 interview with European Sales manager which was also a good experience for me. However, in the last interview there were 3 people, of which one of them kept asking me weird questions like why did u do that why did u quit that job, why did u choose this major when u were 18, etc. I somewhat got stressed and lost my control over the interview. There would be the last interview with the HR, however they send me instead and said that they will return in 24 hours. The next day at 8:15 am they sent me a "Thank you" letter and stated that they would not offer the employmentship. I hope they will at least pay my flight tickets , but still did not get answer about that!!