The so called HR person never receives your call. They will call you for interview when you will reach there, you will found that no responsible person is there. Seems funny. They gave the written test, translating 10-12 physics questions into Hindi. I followed up by email to know about how was my interview, no response. Once I got a missed call from the HR person ;) (rang only one time). I called back but no response. May be the HR process takes time but at least they should respond interviewer's email or calls properly. Still waiting for some fortune and positive response from the HR person since my experience and skills really extremely relevant to the company job profile and during the interview everything was smooth.
Best wishes