No Issue of Appointment Letter & Absconding

I received an offer letter, from company, in which they have mentioned my job profile, pay structure and notice period (60 Day) along with following 3 conditions.. 1- Employment will be confirmed subject to documents verification of Documents provided. 2- The Appointment letter will be issued to you within one month of acceptance of offer letter. 3- The Notice period will be 60 Days. Now ::-- (a) - 1st i rejected the offer then after some telephonic discussion they have promised several things and said that it will be mentioned in your appointment letter, then i accepted the offer but till then offer was already expired. (The date to accept the offer is mentioned in the document) (b) - I have joined the organization 1st of Nov 2018 (the date of joining as mentioned in the offer letter was 8th Oct 2018). (c) During the my serving i asked several times to HR to issue my appointment letter but no response received and i didn't got the benefits what was promised on the phone. (d) Then considering all above practices i discontinued the organization on 2 Jan 2019. since then i was continuously in touch with my manager and colleagues over the phone but on 20th Jan i got an Absconding mail from HR, saying since you are absent without information, you are terminated and 3 month salary (CTC) will be recovered. How should i proceed... 1- I didn't got any Official Appointment Letter confirming my employment, what is the status ? 2- Since the offer was initially rejected and not accepted within it's validity date, does it still valid ? 3- How should i proceed in the matter and get out (i don't want to continue the org. also)