Company demanded outstanding dues after terminantion

I was employed in Capgemini India Pvt. Ltd.. I was in training period. I joined on July 11 2016. After 2 months of my joining i fractured my leg and i returned to my hometown (5 September 2016). There bipolar disorder was found in me. I received multiple emails asking me to report immedeately to office. But due to my medication i could not go. Then they called me and asked me to apply for resignation(i do not have proof in email for this). So i applied for resignation in January. After this i received a mail as well as letter on 17 Feb with subject "Show cause for absenteeism " asking me to report within 10 working days. I ignored this email and letter. Further i received another mail and letter on Feb 29 with subject "Reminder Show cause for absenteeism" asking me to report within 7 days and serve my notice period and it also stated that if they do not get any reply from me then they will consider it as my willful abandonment. I ignored this mail and letter. On 29 March i received a termination letter. It stated that i worked from July 11 2016 to March 29 2017, and asked me to return all the assets like laptop, id etc. I had only one asset which is ID. Now after all this i got a mail on 20 October 2017 stating that i am required to pay Rs. 253817. The amount of 3 months notice period is Rs. 130000. What should i do ? Should i ignore it or reply to it Will this cause any legal proceedings and how deep will it be. If i give medical reason of bipolar will it influence on my further jobs