Can A Company Serve Legal Notice For Not Joining Even After Accepting The Offer Letter With A Penalty Clause

I was recently selected for an organization where in the Offer Letter there was a clause of Breach of Contract. It said that if I do not join I will have to pay 8% of the annual CTC. I took the job because I liked the role.

After that organization people came to my home forcing to join. I got the doubt of not joining because of security and I informed of not joining now they did not agree and said they put this clause since many people do not inform or do not report on the date of joining without intimation.

My question is that if they do not agree and I cannot pay the amount can they file a case against me. This may be termed unprofessional but I signed because at that time I did not have any other offer. I had been waiting for his other company's call and now that I have it I do not want to miss it.

As you have signed the offer letter, you have explicitly agreed to the terms of offer letter issued by Company; hence as a professional you are abide by the terms of offer letter and you have a responsibility to complying with the terms in case of any breach.
Regarding the legal aspect in the subject, Job offer letter is not treated as a legal document. But if the company issued Offer of Appointment and you have signed it, then it will be a legal document.
So please check.