Boss not revealing to me before completion of notice period.

Dear Sir, I submitted the resignation letter to my boss with 12 Days Notice period and I completed the same, but the boss not releasing me. As per contract... 1) During the training period, your services can be terminated by giving (15) fifteen days notice or salary in lieu thereof from either side. After the successful completion of your training period, your services can be terminated by giving one month's notice or salary in lieu thereof from either side. 2) However, if the exigencies of work so require, the management may not relieve you earlier than the expiry of the entire period of notice. It shall, however, be open to the management to accept your resignation with effect from any date earlier than the one offered by you in your resignation or stipulated as per terms of your notice period. 3) The company reserves its rights to terminate your services without notice in case of any act of misconduct or breach of any of the terms of this employment implied or expressed on your part or any conduct which is detrimental to its interests. This is without prejudice to any other right or remedy which may be available to the company Note:- I completed 5.5 years of service, I resigned for attending of my BE regular classes which was started.