Cognizant System Analyst interview questions

There were 3 interviews technical, managerial and HR on the same day. Next day HR called and discussed package also. But when was expecting offer letter from one month came up with a surprise that clients were asking interview. I asked after package discussion and everything why do you require another interview? By the mean time client interview finished and they dint ask many questions and it was very easy. Time passed for another 15 days still they dint come back. When I called and emailed repeatedly they said I couldn't clear client interview... After package discussion almost they made me wait for 45 days and said I dint clear client interview. This was a cruel joke and CTS just kept my profile as back up. When they got another person with less notice period they rejected my profile in the name of client interview. It's a crook HR and CTS doesn't have any fair policy towards new joiners. I suggest pls do not attend any interview after package discussion irrespective of you get the offer or not. Worst exp with CTS.