Company is not giving me releasing letter and forcing me to serve notice period.

I have got an offer from another company but my current company is not letter me resign without serving the 2 month notice period by twisting words. I have already served 1 month and am ready to pay my buy out. Attaching the exact point from the offer letter I was presented with below, 'Notwithstanding any of the clauses of this letter of appointment, the management reserves the right to terminate this appointment without giving any notice or assigning any reasons whatsoever during your probationary period. You will be at liberty to resign from the services during probation period after giving 1 months’ notice in writing or on payment of equivalent salary. After confirmation in writing / successful completion of your probationary period(s), your services shall be liable for termination on giving you 2 months’ notice or salary in lieu thereof without assigning any reason thereof. Similarly, you will be at liberty to resign from the services after giving 2 months’ notice in writing or on payment of equivalent salary to the organization in lieu thereof for the un-expired period of notice. During your notice period you shall not take any leave whether due to you or not without prior sanction. The management may in its discretion, relieve an employee who has given notice and has resigned from the employment of the Company before the completion of notice period, without payment of salary for the remaining un-expired period of the notice.'