About service agreement / bond violation

Hello sir/ma'am, I am Arun Kumar. I work in an IT startup from 5th feb 2018. At the time of joining, the firm got a bond signed by me with an undated signed cheque worth rupees 70,000 to use it in case the bond gets broken down. They promised a CTC varying in between 1.8LPA to 4.5LPA (typically 2.5LPA). After the internship completion, they asked me to sign the joining letter to become a full time (permanent) employee in the firm with 5 lakh CTC. But, as they always play a game in behind the scenes, they explained the salary as 2.5LPA fixed and 2.5 Lakh variable (0% to 100% variable) at the end of year + 3 months time required to evaluate the performance of me as an employee and how much the company earned - on basis of which,the variable will be given. They didn't mention this variable thing at the time of hiring. Now as I was not OK with this offer, I asked them to make the fixed salary to 3.5LPA and I don't care about the rest(variable) otherwise I won't be able to accept the offer. On this answer, the CEO replied that he is not going to change the amount as I want and in that case I have to resign as Its my problem that i don't like their offer. Here in this situation, if I resign, then they would execute the bond which I don't want to happen. I told him to take action and its his call to do what he want to (fire me if he want to, which leads to bond failure). I want to ask if there is any way out of this to fail the bond. Thanks