Dear friend, rules exist in the realm of employment to be followed, not flouted. If you do not like the job for any reason, you are free to submit your resignation, adhering to the exit conditions outlined in your employment contract. What hindered you from resigning with adequate notice, especially in the case of personal inconveniences like the one you described regarding the buy-out of the notice period?
As the other knowledgeable friend mentioned, failing to comply with the latest notice may lead to the management treating you as an absconder, potentially resulting in termination following due disciplinary procedures. Such actions could negatively impact your prospects for future employment.
Hence, it would be prudent to formally resign now by fulfilling the notice period requirements, ensuring a peaceful departure.