I was contacted through a consulting firm. The consulting firm kept calling every alternate week for 2 months. After 2 months of on and off calls the HR called(mobile call). The HR was friendly at first then when they didn't hear the expected answer - they became rude and started speaking disrespectfully instead of listening.

HR -> Background checking User Interview 1 -> Problem Solving / live code User Interview 2 -> System design / high level User Interview 3 -> System design / low level VP Interview -> behavioural interview