Teacherji,
A piece of advise first,
Never ever join the company who seeks your original documents in their custody.
Please note that no employer should ethically be asking for documents to be kept in their custody.
Note that our constitution also states that every individual has a right to employment of their own choice and no one can force them to do a job against their will.
Holding your original documents is a method to keep you holding in the job even if you wish to resign which acts as a blackmailing agent.
Suppose if the employer tells you you can't resign else we won't handover you your original documents, what would you do???
Another thing.
Was your resignation tendered via letter or email or was that verbally spoken?
Were you issued any relieving or acceptance of resignation letter?
Did they give you in writing how long would it take to process your Full and Final settlement and to hand over your originals back to you?
What is mentioned in your appointment letter regarding the time frame to process your F&F?
Kindly give details on the above mentioned questions, then we can think on how to proceed further.