Citi Performance Test Architect interview questions

I was told that there will be 2 interviews . I cleared first one and HR scheduled second and final round. I did wait for 30 minutes on video conference but noone arrived. I approached HR again asking about status and if they are planning to reschedule and I was told it will redchuled in couple of days. Although HR we're good and communicated properly initially but later they even stopped responding. Not sure why final round was scheduled .