Durianpay interview questions

Got contacted by the HR. HR very details and able to dig the candidate's potency. Interview steps quite a lot, in total 5 steps of interviews as well there is a study case that needed to be solved and I need to present it later on the next session. But the whole process is quite fast took around 3 weeks.

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.