Notice period and buyout option

I have resigned from my company, and the notice period is of 3 months, I am ready to serve 1 month and buyout the remaining notice period. But the company is denying from buyout. Following are the lines written in my agreement : 1. In case you have resigned or given a notice to terminate your employment, you are expected and required to diligently serve the entire notice period. However, in such a resignation situation, the Company may, at its sole discretion, without being obligated to do so, A. Require you to leave service at any time during the notice period without any payment for the balance unexpired portion of the notice period or B. Upon your request allow you to leave service during the notice period only upon You making the payment to the Company, the amount equivalent to your salary for the balance unexpired portion of the notice period.