QuinStreet Security Engineer interview questions

The first interview was with HR, Second round was the technical round with 2 of the senior people and then there was third technical round from US team, three of the rounds of interview went well. In third round round Interviewer has confirmed that we would go for the next step and HR will get back to you. There was no follow up from HR side so I had to reach them, HR mentioned he will check and come back but then never responded. It seems they go through interviews without having a process nor updating the candidates of the status of their process. That was very disappointing and not professional at all.