i joined an MNC related to mechanical engg. field in june 2016. at that time the company asked me to sign a bond for 2 years but if i leave i have to pay 6 lakhs to them.in september, i got ill because of the unhygienic food served in the office. i had to take leave for 3 weeks. after joining back the officers started to behave rudely, did not give me work and wanted me to just sit ideal in the office for 9 hours. in early November i asked my managers to change my seat as ac duct was directly above my seat. I had reccurring fever with inflammation of joints.for whole of the november i asked them to change the seat but they did not do it. in late november my condition got worsened. so i quit..after that they wanted me to serve the notice period.they keep calling me to the office. now they have sent me a letter through courier stating the full and final statement letter in which it is written that i have to give a sum of 4.5 lakhs to the company through demand draft.
what should I do as my health is still not in good condition.i did submit my medical records but they think they are forged documents. at several times they have misrepresented themselves. they even did not give me the copy of the bond. what should i do