C3 AI Software Engineer interview questions

Got email from HR, that they need to schedule an interview. I provided them dates. Had my first interview scheduled. I completed my first round of interview at C3AI, the question was very hard(till now not able to find that question on google), very unprofessional and rude interviewer. Even though I was able to come up with the solution for the question, and felt like interviewer was kind of satisfied with my approach. So overall it was kind of okay from my side. After this interview I was expecting response/follow-up about the same from the HR. Now this is when HR went off the radar. I never received any email, even after I reminded them multiple times (at least 5 times). I was ghosted till the end still haven't received any response from the HR. VERY unprofessional behavior from C3 AI.

Reached out by one of the engineer on LinkedIn and asked to send resume Online coding test, recruiter phone call, 3 rounds of technical interview, 2 behaviour rounds with hiring manager