Breaking bond in IT startup Company

Hello, I have signed the bond for 3 years (2.5L or One year ctc which is more that will applicable if I brake the bind) in IT company and they have offered 1.75L package (In hand salary is 9.5K/pm after all deduction). Also they took my original certificate (10th, 12th, and B.E) still I accept the offer in 2019 march. But they said they will increase the package after one year. but right now due to corona they are saying we cant increase the package and they're postponing the hike process. So i have requested them to atleast for release me from company so that i can search job in other companies. But for that also they are saying u have to pay the bond amount as u have signed the bond. Right now i have completed 2 years in this company and i don't want to work anymore here due to managers harrassment, low salary. but Am not capable to pay 2.5L also. So is there any solution for this. If i abscond then i will not be getting my original certificate, releiving letter, experience letter. Please help me to come out of this situation.