Siemens Software Engineer interview questions

Interview was good with good technical questions relevant to my experience, attended two rounds of interview, received mail from hr that I am selected, but she assured me offer letter will be released same day, but to my surprise position is withdrawn after 2 months of waiting, don't play with resources, my request to others don't share your professional reference details, they will conduct interviews just for fun not to recruit. Siemens is big cheater in the market

Got call via Naukri via allegis global Online prescreen test - 30 multiple choice Round 1 prescreen- 2 questions in 15 mins, easy questions Round 2 - tech round - 2 tech experts, nice questions and really helpful and patient interviewers Round 3 - architect round - 1 tech architect, mainly question my current projects and design patterns Round 4 - manager round - project explanation and simple questions Round 5 - tech round 2 - 2 experts well versed questions Round 6 - HR - simple HR questions. HR didn't revert back. No feedback and no communication