Left without Notice period because of Corona fear - After 5 months the company is asking me to pay 3 months salary

Left without Notice period because of Corona fear.
Hi, I joined a company on March 15 and left the company on March 16, because the job requires full-time outdoor work (collections) meet many people, so I was afraid to work , even the Govt.of India put a complete lockdown from March March 24. After 5 months the company is asking me to pay 3 months salary ( around 1 lakhs) and harassing me , they not even listening to what I want to say. I am from a different state and if I get infected no one is there to care. What should I do now? please, anyone, suggest something , now they told they will move legally. They can consider it as a joining drop out but they are not willing.
Kindly suggest something.

Hi Tom,
Despite the fact the employer has the right to insist to serve the Notice Period, nevertheless it will be too harsh on them to insist on cash down, not fair. How big is this Co. Do you consider it worth continuing there or better to seek elsewhere. What were you doing since you left on 16 Mar.? If you are prepared to face the legal process I don't think they'll stretch it that much. Did you submit any joining report or just walked-in & walked-out the next day? Did you sign any acceptance & taking over some responsibilities. (In any case this experience will not be counted for any future prospects). If yes, then you should resign formally. If not, My suggestion is to send a letter to them to treat the joining withdrawn as not accepted due to Corona lockdown.

Dear Tom-Mathew ji,
You worked for only one day and left. Your company is asking for three months salary from you. It is ridiculous.
Has your company issued you any appointment letter?
If yes what is the clause in the appointment letter for separation?
Was your employment on probation or you were taken as confirmed employee?
What position was offered to you?
How big is this employer?
I failed to understand how this employer has the right to insist to serve the Notice Period, and that too of three months.
It will be a foolish thing on the part of the employer to move legally against you.
I advise you to just ignore the threat of the employer. At the most you can write to the employer your inability to continue your employment after working for one day and therefore treat the joining withdrawn by by, as suggested by our learned member Prof. Kumar.