Tech Mahindra Software Engineer interview questions

there are 4 rounds conducted in Aptitude test, Technical HR, Group Discussion, HR Discussion which will take atleast one full day and they will reveal the result during night time and one should have complete patience to attend the interview

I had a call first that my resume is shortlisted. I wrote an online exam.then attended a telephonic round was selected in both ....Then i was asked to pay money.for which I refused because according to the companies law it was against the company .... Because it was in the official site of tech mahindra ..That they don't charge any money for any kind of interview.