HCLTech Technical Applications Support Engineer interview questions

I have gone through 3 rounds and I got selected in HCL. HR send me the mail to submit all the experience letter, identity proof, relieving letter etc. I had wait for the offer letter for 30 days approximately. One day HR called me and said that the job profile has been closed without any selection. I was just surprised what the hell was going on. Why you wasted my time. I had taken 2 full day leaves. Now I'll never go for the interview with HCL.