Service bond

Hello, I am employed in XYZ company from last 4.5 years. I joined company on Dec 2013. I signed first bond of 2 years validity amount 2 lacs in Dec 2013 & was on deputation in abroad from Jan 2014 to March 2015 for training. the bond starts from when return date to India up to 2 years further. so after returned to India in March 2015, the bond effective from April 2015 & validity end on March 2017 so, I served that bond period. In the between period company signed second bond in Sep 2016 (before visit to abroad) when first bond was active and stated that the first bond is going to expire. I need to travel abroad for project work once in a year as per project and customer requirement & travel ticket cost is reimbursed from customer that is abroad (there was actual billing to customer), there was no training involved in it. but still in bond it is stated that this bond is for training to employees And also they signed the bond at last moment before start of journey.so my second bond is in effect from Dec 2016 which is having validity of 2 years up to Dec 2018 & amount 5 lacs. I resigned from company because I am on same designation from last 4 years, they were not giving promotion as well as they are restricting the employees to join other companies due to bond & also to have better prospectus on march 01 2018 & serving 3 months notice period to finish the project responsibility in hands & smooth handover to colleague up to 31 May 2018 . employer is asking me to pay 5 lacs up to 15 march 2018 as stated in bond that I am not completing the bond validity period. So I asked employer to provide bond documents but he is refusing to provide the same. so, i informed employer that i have 2 months Privilege leave credit in my account so they minus from remaining 7 month period & i will pay 5 months amount like calculation 500000 Rs /24 months = 20833 Rs. so, for 5 months it is 104000 Rs. but they are not accepting that and telling me to pay the 5 lacs amount & get the reliving letter. Now they are stopped my monthly salary & mentally harassing me for pay the 5 lacs amount. Also they are not providing the bond copies which I have signed. Could you please let me know what should i do ? from where i can get support. What should be my next action.? What proof we will require if I go for court case.?