HR/Line management is not employer and they are other employees in the company.
You are not supposed to obtain any permission from them.
If compnay has made them a stake holder it is its internal business.
Resignation can be without permission and notice.
The notice of resignation/resignation should be addressed and submitted to good offices of appointing authority, MD………..under proper acknowledgment preferably thru redg.post.
You may demand the acknowledgment of notice/acceptance of resignation, correct FNF statement, FNF dues by bank DD only, Form 16 as per correct FNF statement, PF number and account slips for whole period of employment, ESIC card ( if eligible), salary slips for the month of ………….., work experience/service certificate, relieving letter, acknowledgment of company property/handing over of charge, etc be supplied to you within last day in office, by redg. post only.
Since you have initiated termination, thus breach of contract to serve notice paeriod, you have to comensate the employer and this compensation is already stated in appointment letter in the form of notice pay.
You may afirm that notice pay be adjusted in FNF statement/settlement or you may enclose the cheque for notice pay @........as in appointment letter or as suitable to you and ask the good offices to issue acknolwedgment on the spot and show it in FNF statement.YOu should also affirm to submit the compnay property/handover the charge.
You should mention that you have completed all tasks on hand and nothing is pending at your end.
Abscondment: is by intention.
To abscond: is to leave without permission, escape, hide,…………..
Absconding is different from abstaining.
If you have tendered nresignation in line with clauses i standing orders of the compnay/contract of employment you have not absconded.
You should deny in subsequent communications that you have absconded and may diclare the word "Absconding"" is derogatory and you protest..
Reliving letter is supplied post all settlements by employee e.g. hand over of charge, company property etc………….completion of exit formalities.
If you have not left anything pending at your end then compnay can not allege that you have caused any loss.
There are many threads in similar query. You may got hru these;e.g;
https://www.lawyersclubindia.com/forum/Relieving-letter-employer-causing-delay-not-issuing--82265.asp#.UbXxVvlVPxo
https://www.lawyersclubindia.com/forum/Issues-with-full-final-settlement-with-employer-81838.asp#.UbXzAflVPxo
https://www.lawyersclubindia.com/forum/Notice-period-81859.asp#.UbXzE_lVPxo
It shall be approrpiate if all your representations are structured and drafted by a competent and experienced labor consultant /service lawyer.