DePronto Infotech interview questions

I had total 4 technical interview rounds for SQL|Database developer role. It was truly horrible experience. HR was extremely unclear and confused throughout the process. They cancelled my third technical round 3 times. On one occasion as per HR's suggestion I joined call and I waited for 42 minutes for panel and after waiting hr told to drop off. Panel was always late and finally they scheduled my third tech round the interview lasted for a grueling 6 hours. It was incredibly difficult and genuinely felt that they were doing it purposefully. After a week hr told me I am not selected. Again after few days she told me I am selected and scheduled 4th technical round it lasted for 1 hour and it was good I almost answer all question HR kept me delaying a concrete result after few days they suddenly ghosted me. This entire process took 1.5 months and was most unprofessional and frustrating experience I have ever had. I was prioritizing this interview because it was remote opportunity. I wasted my time energy on this nonsense. and unfortunately I lost other opportunity because of it.