Flex Program Manager IV interview questions

I had several interviews mostly related to work and experience, but some interviewers asked some personal questions and some other questions not related to the position. The interviewing process went too far. I had to do the medical examination and my references were contacted too. Everything seemed to go well. I even had a call from the hiring manager saying I was selected for the position, then I received a call from HR with a verbal offer, but I did not get a written offer. I called the following days but suddenly I found out (by a call made by mistake by the hiring manager) that the HR representative decided on my behalf telling that I did not accept the offer. Very disappointing process. I thought Flex was a formal company.