Force to resign from Job

Dear Sir/Madam, I was working in a Private Company in Mumbai and I was forced to resign due to my bad performance (as they told me). I sent an email to my HR Team mentioning " I am serving my resignation letter due to my bad performance, with immediate effects. I worked there for 2.5 years and on the same day, I left the company. after 2 days I received a call from HR asking about the matter and for discussion about this. I explained the same and expressed my intention not to return to work. after 4 days I received a letter asking me to serve the notice period of 1 month and handover the work. I can hand over the work but can not serve the notice period also I am not asking my F&F and told them to adjust my Notice period against my earned leave. Q1- What are my rights here? Q2- Do I need to serve the notice period & what are the consequences if I am unable to serve it? Q3- what kind of legal action they can take? Q4- if they take any legal action, what I can do to counter them?