Nothing, on the contrary, issue legal notice to claim your F&F + experience certificate. And if they will falsely declare you absconder, you are incline to file for compensation by filing defamation suit. Since you have duly resigned and due to medical condition, it is impossible to serve any notice period (if any), company act to declare you absconder is parallel to black mail and promoting forced labor whcih is a criminal offense and HR is personally liable for it. 

Company cannot do any thing.

 you have to pick up this matter in the high court and let the company  reply in High Court that as per the medical advice and report of health conditions the resignation not accepted and the F& F accounts not been done accordingly.

In event any legal notice is issued to you engage a lawyer and reply to legal notice 

2) enclose copy of your medical reports that you are suffering from facial paralysis that you never absconded from duty 

3) mention correspondence exchanged with company wherein you had sought Leave without pay and subsequent resignation 

1. Accumulate documentary evidences of your physical ailment (reports, tests, medicines etc.... ) for the treatment undergone /undergoing. ALSO all correspondences (in any manner) with the Co.

2.  There can be no legal prosecution for the term "absconded", more so since you apprehensively did not have any co. assets or documents in your custody, that could have any losses to the co.

You can properly resign. You don't need abscond

You first gather the medical records and secure them s they may be required to be produced as evidence at the time of a dispute being heard by a court of law if the company is taking a legal action through court of law in this regards.

Even if the company is declaring you as absconding from the job, you may fight it based on your medical records as well as the treatment particulars including the Ayurveda treatment.

1. Yes they can consider you absconded as you have not served the notice period according to them. 

2. But you have good defence as you have sent them mails regarding treatment period and resignation.

3. You should reply to their mail that you have served them proper notice of resignation and had to leave the job due to medical conditions.

1. Even if you have not executed a specific contract with the employer you are governed by the rules framed by the employer.

2. If employer files a suit for damages on account of breach of contract then you may in your defence plead that due to physical disability you could not perform your duties, hence resigned.

Dear Sir,

Be assured nothing the management of company can do against you. You have every right to resign in the light of your medical background. Please see the following. A fitting reply to be given to the legal notice if any you receive in future. You may claim the balance dues if any.

==================================================================================

Employee Has Right To Resign, Subject To Stipulations In Service Rules: SC Relief To Ex-Employee Of Air India [Read Order]

Supreme Court - Daily Orders

Sanjay Jain vs National Aviation Co. Of India ... on 1 November, 2018                                                

                                                                                    REPORTABLE

                                      IN THE SUPREME COURT OF INDIA

                                       CIVIL APPELLATE JURISDICTION

                                      CIVIL APPEAL NO.7822 OF 2011

       SANJAY JAIN                                               APPELLANT(S)

                                              VERSUS

       NATIONAL AVIATION CO. OF INDIA LTD.                                 RESPONDENT(S)

                                                      WITH

                                        CIVIL APPEAL NO.10881/2018

                                 (ARISING OUT OF S.L.P.(C) NO.27941/2017)

                                                   O R D E R

Resultantly, we allow the appeal. The judgment and order passed by the High Court and the order passed by the respondent declining to accept the resignation are hereby quashed. The benefits which may be available shall be paid to the appellant. Provident fund with the prevailing rate of interest from time to time. The gratuity, if payable or any other benefit, shall be paid with interest @ 6% per annum. Let the outstanding amount, if any, be paid within a period of three months from today.

See in case they file suit based on your medical condition it can be contested as it was not for see circumstance also since there is no bond signed the company cannot force you to pay since there was no agreed amount of damages. So in case they are filing suit you have to engage an advocate to contest it.

There is no need to worry as acceptance of resignation is not required as per law. They are bound to accept your resignation. No need to pay them anything asyour resignation is fully justified legally.

If they fail to pay your full and final settlement amount, you can file a suit for recovery against them.

issue a legal notice through an advocate and enclose copy of medical reports and claim FnF settlement.