So many rounds of interview : positive reviews during interview , they gave all hope like their almost hired but ghosted and no reply or feedback after that . It was shocking

I applied for this role through an employee referral and received an email from the HR within 5 days. The HR wanted to know my background, qualifications and salary expectation before scheduling an interview round with the hiring manager. I had to give these answers in the form of an email. After sending the responses, I did not hear back from the recruiter for almost 2 weeks. I emailed her twice to check my application status (whether I've been rejected), but I did not receive any response. After almost 3 months, I got an email from her saying "Thank you for the time you invested in the interview while we are sorry that we have selected someone else for this position" I never gave any "interview", nor did I receive any feedback from the recruiter. It was highly unprofessional on her end to not have a simple ethic of responding to a candidate (when she has emailed a couple of times)