Bond breakage

I have joined in Tech mahindra in 2015 aug and signed a bond for 2yrs which states on breakage of it i need to pay 1 lakh . I have worked in company for 1yr. And due to health issues i have quit the job by informing my project official and hr team due to my health issues. I have retured all the assests of the company within a span of 10 days of my quitting by dropping official mails to project and hr memebers. As we changed the home i didnt get any further notifications from company. But i got to know they sent a letter to our prior address.So i mailed them(HR)stating them that i have relocated so let me now the further details of bond and other information regarding this isssue in july 2017 giving them my personal gmail id and phone number to contact me but i didnt get any information. But today i received a notice from lawyer stating to pay a sum of 1.5 lakhs within 7 days of the notice otherwise a criminal suit will be filed. Please let me know how can I further solve this issue and get the amount lessen as I am from poor background and cant pay such a huge amount in just 7 days.