You may show the job advertisement, offer letter, appointment letter, standing orders of the company and bond to a competent and experienced lawyer in person and give inputs and let your lawyer evaluate the merits. The bond may in violation of standing orders of the company.
The 3 months training provided to you was in fact a training that added to your skills or qualification or you worked like a regular and normal employee? If the training was eyewash then what is the basis of enforcing a bond?
Has the company issued an acknowledgment of your certificates?
Have you signed a declaration that you are depositing your certificates with the company?
Is it a part of the statement in the bond that the employee has to deposit the certificates with the company?
Instead of absconding you could have approached the company to accept pro rated payment to relive you e.g. Rs.200000/36*9=Rs.50000 or you could have declared that company enforced bond claiming a training of…….was to be provided but has not provided any training, hence company should release from bond.
At that time you could have approached a lawyer.
Apparently company has not supplied you any communication to join duty or face action on disciplinary grounds by effective means of communication e.g. email {although your email id was on record} redg. post/ courier of repute { although your address was on record}.As per your post neither company has supplied you order of termination.
All of this is happening as the company knows that one fine day you shall comeback to get your certificates and reliving/experience letter.
Company might be denying FNF statement, FNF settlement, Form16, PF a/c slips, PF withdrawal/transfer, work experience/service certificate, relieving letter as per its internal policies. You may require obtaining some handle on the company to bring it to negotiation table. A smart lawyer may be in a position to help you. You need to build a ground for a win- win situation.
As far as your certificates are concerned you may obtain duplicate copies. Another company may employ you on the basis of your appointment letter, last salary slip, an affidavit/indemnity from you that you are not employed elsewhere.
The courts may not agree that company can have a lien on your certificates.
In case of termination also company should issue you service certificate as per model standing orders.
You may find the attachments useful.
Visit a competent and experienced lawyer as ap.