NetApp Outbound Campaign Manager interview questions

4 rounds - 2 F2F, 2 via video call - No proper feedback. Interview started from August 16th, 2019 and last round was on August 29th, 2019. Did follow-up with recruiter, no feedback was provided. What really disappointing about this experience is, after 4 rounds of interview, I was not informed that I am not shortlisted, I just have to assume as there is no communication. This is not acceptable, I understand, it is difficult to provide feedback to all applications, but at least ones which were part of interview process, deserve to receive feedback. Recruiter doesn’t respond and they only call when they want to check suitable time for interview.