Separation policy

Hi, I am currently working with BPO in Noida from past 6 years. Now I got another good opportunity in same sector but they want me join within 1 month. Notice period in my current organization is of 2 months. Now the issue is that my current employer is not accepting my resign and forcing me to serve full 2 months notice period stating they have peak in process. I am ready to serve 1 month notice period and buyout the rest. Please assist as I really don't want to loose the opportunity.