Oracle Software Engineer Senior interview questions

1st round HR cold call 2nd round onsite programming language test(C++) and interviewed by director via Oracle collaborator 3rd round: telephone interviewed by one manager and senior developer for job fitness and skill level (from India) 4th round: telephone interviewed by one director and one manager ( again from India) 5th round: hiring manager from US 6th round: HR verbal offer

I applied online and immediately got a phone call from recruiter very next day. The recruiter scheduled phone conversation with hiring manager who provided me a coding assignment to be worked upon offline. I got no feedback whatsoever on the assignment. Another phone interview was scheduled with additional team member. The interview was pretty vague just to find out my skills and some knowledge questions which I am sure I answered thoroughly and correctly. I followed up after a week and recruiter replied in negative. The worst part is I spent several hours on the coding assignment that at least deserve some feedback in my honest opinion and I found the behavior very unprofessional. Add to that there was no update unless I followed up. Thumbs down Oracle.