DigiCert interview questions

The interview process started off well, the interviewers gave positive feedback throughout, and I genuinely felt the conversations went smoothly. However, after the final round, I heard absolutely nothing from HR. No update, no rejection email, no closure of any kind. I followed up multiple times via phone and email but was completely ghosted. Ended up wasting three weeks waiting for a response that never came. If the role isn't a fit, a simple email would have been appreciated, basic professional courtesy that was clearly missing here.