HARMAN interview questions

Got a call from their HR that they found the profile on Naukri and have a suitable open position. Scheduled 1st Technical Round: - It was average difficulty, they asked basic core java questions, OOPS, collections, Java 8 features, little bit concurrency, etc. - Asked to share screen and write some pseudo code for some basic programming questions. SQL queries etc. - The round was cleared and just after 30 minutes of interview I got call from HR that I have cleared it and they want to schedule next round. I was impressed such a quick response!!! 2nd Technical Round: - Same as 1st round, almost the same questions as 1st round. - Same asked to share screen, basic programming questions, SQL queries etc. - Just after 10 minutes of clearing the interview got call from HR congratulating me and asking me to schedule the last round with hiring manager. I was again impressed by such quick response of HR!! Hiring Manager Round: - Asked about how you implement authentication and authrorization in your project, some basic application design related questions etc, salary expectations etc. After this call the HR told me that they will collect my documents and release offer. They did collected the documents but after that I never saw that offer letter. 3 interviews, document collection and after that HR will just ghost you. They wasted my time.