EPAM Systems Sr. Software Engineer interview questions

Recruiter contacted me on LinkedIn, first there was a test, and then the technical interview. The process is still not clear to me, the recruiter just ghosted on me after my technical interview, before that, the recruiter was responding me within minutes.. This is quite frustrating for me as both the technical interview and the test went pretty well(atleast in my opinion)..

Round 1:- All into technical related to Java and Coding programs. Round 2:- interviewed by 2 On-Shore folks, All into System design. asked me to design Outlook meeting flow, Some Coding program, some behavioural question regarding current roles and responsibilities. Round 3:- Interviewed by hiring manager from Offshore. Some system design question, seems he was impressed and then asked me about my expectations and joining date. Round 4:- HR discussion, this was very unprofessional discussion. He was not fine with my expected CTC and instead of negotiating, he told “I waisted his time….”. also said I got rejected in last round…… really ? If yes then why this HR discussion being held. If this is the case then how about my time ?