You say that you got offer from "so-called" company. Do you know the meaning of phrase "so-called"? Meaning of this phrase is doubtful or suspect. Therefore, the question arises is when did you come to know that the company has doubtful activities?
In your post you have written that company had attached clause on reneging the commitment to join. It was payment of Rs 1.5 Lakh in case if you fail to join the company. However, question arises is how the offer letter was issued and how did you accept the offer letter. Have you been issued hard copy and while accepting the hard copy did you give acknowledgement also in the hard copy?
Further advice would depend on the question asked in the second paragraph.
Sorry for the wrong usage of the word "so-called ".
They had sent me the offer letter through the email. I took the print out of that and signed it. I had sent it via email. It was soft copy only not hard copy. Please let me know if you want to know more.
You have said that you attended only a telephone interview and then the offer letter was sent via email. Please check the legality of the company from which you have received the offer. Demanding money for refusal to take up a job after accepting the offer letter is unheard of.
Click on the "+" sign for more helpful answers like these