Learned members have given their valuable advice, and you should build favourable circumstances.
1. You must have submitted "Notice of Resignation" and not resignation letter.
2.You must have submitted "Notice of Resignation" under acknowledgment e.g email read and receievd,
AD of Registered post.
If you have submitted by hand obtain company seal on your copy from concerned desk, and obtain the date of actual submission on your copy.
3.Send the followup letter (preferably thru inland registred post i.e type or write on the page and then fold and convert it into envelope and affix postal stamps and book as registred letter and obtain receipt), and record that you have represented to Mr.....on dated ...........and Mr.............on dated..........and have clearly appraised that you shall be resigning on dated...........as already mentioned in your notice of resignation dated............submitted on .................vide email dated..../registered .........under acknowledgment.
If you have sent regsistred post you may obtain acknowledgment and POD of all registered posts by applying at concerned Post office and affixing Rs.10 stamps on your application.This shall be highly useful.
4.You may mention that you have completed all asignments /projects and all work assigned to you should be keeping in mind that you shall be seperating on dated ...as per our notice of resignation.......
It shall be appropriate to address all communications to your appointing authority.
You may mark a copy to your reporting authority,HR-Head.
5.Compile the list of all company property e.g. ID card,visiting card,laptop,etc...and you may mention that as per your records the company items with you are ...........and request them to confirm the same, and to whom company property needs to be submitted under receipt.
6. Hope you have not signed on any other document during,beforer,after, your onsite assignment e.g any adittional conditions to your employment,corrigendum.
it shall be important that you check your records and discreetly confirm with oncerned HR personnel, and arrnge to do the neeful.
7.Each industry includig yours has its own compulsions.
If your prospective/next employer is willing to accept you without resignation letter, it may be good for them since they shall be getting a person having skill/qualification/education/experience required by them hance satisfying their need and purpose, but this does not exonerate you fro your legal and professional responsibility, hence you should complete all due formalities in writing and under seal and signature of the competent employee of your current employer.
As adviced by learned members you should expres yourself to your next employer in writing under receipt.
8 If you have not signed any adittional condition to your employment other than as in your first employent letter,or if no other communication other than your appointment letter has been communicated to you, you can resign on the date as in your notice of resignation and send a formal resignation letter as suggested and under acknowledgment,and in the same letter you may rase your claim to supply you, acceptance of your resignation,work experience letter,F&F,PF accumulation reports,Form 16, NOC,NDC,relieving letter ,any other relevnt document,and you may ask for receipt of company property, and to pay your dues within .......days.
9. You can submit copy of your formal resignation letter with copy of its desptach detail,acknoledgment to your next employer and you may mention all documents submitted by you in your employment forms submitted to your next employer and obtain an acknoledgment of the same.
During this phase you must have learnt that you shall have to wriggle out in your ventures .
Act smart in your future ventures.