Salary withheld by a private International school

I worked at a private International school in Bangalore. Due to oppressive work culture, I resigned from my job in October. I am still in the probation period. The school made me sign a training bond after making me attend the training as a job requirement. This bond was for 2 years or reimburse School for 1 lakh INR for the cost of training. After research, I found out that the training cost was less than Rs. 10000 Now the school has withheld my paycheck on the condition that I first pay the cost of training as 1 lakh. Even after providing them the document for the actual cost of training and offering to deduct actual workshop fee from my pending salary (60K +), the school is not agreeing to it. The HR has mentioned that I can go to court, they already have 7 pending court cases and wouldn’t mind an eighth court case. Please let me know what to do. I would like to take a legal action but the school has big connections and already harassing other teachers, with no outcome. Your advice will be very helpful. Thank you!