I went for an interview on 30 September saturday ,...

I went for an interview on 30 September saturday , got selected after clearing two rounds L1 and L2 then HR told me we will mail or call you on monday to submit documents and salary discussion. I waited for one week no call or email from there end. I was constantly following them but no response. I asked the Hr for how many positions they are hiring she answered for more than 1000.After continues followup till 15 day finally I got answer as they kept me on hold. Exact one week later again got a call for an interview for the same role.same situation happened with one of my friend she attended the interview and cleared on the same day in Mumbai location. I don't know why they are wasting there's as well as others time.