HCLTech Senior Developer interview questions

I cleared all the technical and HR round even salary discussion also done. Even HR send me salary structure too. but when I asked for offer letter they just postponing it day by day.And suddenly one day she told me my candidature got cancelled. When I asked the reason she didn't tell me any thing neither in mail nor in call. It's kind mental harassment only. Even they convenience me that much that I was going to resign from my current company. Thank God I didn't put papers in my current company. How can these people simply play with our career.

2 Technical face to face rounds and 1 HR round. Technical round was difficult but if you are well verse with your skill set you will clear it. Before going for interview your resume is selected first and than you are called for interview