Employement Bond Break

I have joined a company in Jaipur on Nov 2019 with a bond of 2.5 Years. In the employment bond it is written that they will provide 6 months of training but training got completed after 3 month of joining and I started working on some project but after 6 month completion they extended out training to additional 6 month and did not increase out pay but It was written in bond that salary will increase after 6 month of training , training also got completed in 3 months. I mailed to them regarding why training period got extended they say they are going by bad phase but Company founder said in a meeting they are not much affected. So I continue to work and increased our salary 12 months after the joining instead of 6 month. So I continue to work but after 1.8 Years I decide to leave the company due to work pressure as management was very bad. HR was very negative person. HR and their Accounts person threaten me that your career will be zero. BTW HR was very bad.I have never seen this type of person in my life. Bond is of 1 lakh as stated in Agreement and Notice period is of 3 month. I decide to leave company after 1 month as company culture was very very very bad. They actually giving me so much work of more than 2-3 project with so much under paid salary that one day I decided to leave the company with only 1 month notice period. Of course They rejected it but I leave the company after 1 month so that they have time to compensate by absence. They violated their bond first and did not even intimate us though mail or anything. So I received a Legal notice of more than 2.2 Lacs stating different damages but I did not even earn that much of money in their company. They kept on harassing me that they will go to court and even on work they use to give me lots of work due to which my health was deteriorating very bad and I leave the company. They even shifted the appraisal period with their own consent without notifying us and now asking for this heavy amount. I want to know what is validity of bond if they own breach the contract by their own means and kept me underpaid for 6 months without notifying me and giving me only and only mental pressure due to work. Biggest regret of my life to join such company with bad HR and Bad peoples.