Bizfast Infotech interview questions

At first they called me. They got my phone number from the timesjob site I guess. They told me that my CV was shortlisted and asked me to give the interview. In the interview they told me that I had to pay 30,000/- then i would be considered as a employee and I would get salary. I gave check of 30,000 in no time they sent me offer letter and joining letter.