Nbyula Software Applications Engineer interview questions

Got a call from HR after applying on LinkedIn. The first round was relatively simple, and I got positive feedback and proceeded with the second round. I did the second round comfortably as well, with minor hiccups. However, I didn't call or email(not even generic template ones). I tried contacting HR's phone number I got the call. I couldn't connect with her as it was always a busy line. They have GHOSTED me. I didn't expect this after putting so much effort into interviews. I slipped an email to the support team. Guess what? No response so far. I am utterly disappointed with the interview experience. Why can't they drop one of these template emails for rejection? It is a bear minimum they should do.