What happens when a bond fails?

I'm seeking legal advice on the below situation. In 2021 March I purchased a bond(specific investment plan) of a private company with an investment amount of 150000 Rs and 26 months of maturity. As per the bond, the Company should repay the amount of 300132 Rs on maturity i.e. May 2023. In June 2023 the company sent a notice stating that the settlement would be extended for another 3 months and they would be starting the settlement from 15th September 2023. On 21st September 2023, They offered me to settle with the principal(150000)+ 10%(15000) additional amount i.e. 165000. What is the best course of action in this situation, please suggest also how I should proceed. Accept the offer or legal fight? how much cost it will for the legal fight?. Bonds Terms and conditions are as follows : 1. Income is subject to the risk involved by the company 2. in case of natural calamities, the maturity period may extend up to 6 months.