Foundever interview questions

I applied for the role online and the recruiter reached out within a couple of weeks. She briefed me on the role and then asked me basic questions in the first round. I then had three more interviews with a variety of panel members including a case study and presentation. A point to note is that after the third round, the recruiter ghosted me for two weeks on the pretext of 'busy schedule' and then reached out with information for an additional round. After this round, the recruiter again ghosted me and it has been 4 weeks since. Even after countless follow-ups on email, I have not received a response from them. I believe this is quite unprofessional from their end, especially for a candidate who has spent countless hours preparing for the interview and has already participated in four rounds.