You have made an issue of a non-issue. If someone has faked the documents during the recruitment and after verification, if it is proved the documents are fake, then you need to issue the show cause notice and on receipt of the reply just terminate him/her.
By the way, since the date of joining, when do you discover the falsification? How much time does it take?
As a suggestion, I can say that hereafter, tell the candidate to bring along affidavit signed by a notary stating that he/she is liable for termination from the employment if documents that he/she has submitted are proved to be false. The genuine candidates will not shy away from this new condition of the recruitment but help to stave off the candidates who have forged documents.
Lastly, Swati please note that we work to protect the interest or image of the organisation. Whichever department that we work in, we must strive to do that. Interest and image of the company are supreme and any wrongdoing, if observed, must be reported to the competent authority. Therefore, for the past falsification of the documents, go ahead and report to them. Your job gets over thereafter.
You can either talk with them in person so that you can get a clear idea as to why he/she has done that in the first place.
I hope you found this information useful.
If you have more queries regarding any other labour laws, you can contact me @8356832404