Notice period

Post successful completion of your Probation and upon confirmation of your permanent stature within the Company the employment hereunder may be terminated by either party at any time, without cause other than termination by Company for Caused with prior written notice of 30 days Provided however that at the Company's sole discretion, it may immediately relieve the Employee from all duties and responsibilities by payment of Thirty (30) days' salary in lieu of such notice. All benefits from the Company shall cease upon completion of this notice period. However, if you fail to provide the required notice, as stated herein or fail to work through the said notice period and/or co-operate in satisfactory handover of your work, you shall not be entitled for pay equivalent to notice period. These provisions shall not prevent the summary termination of employment based on management policy and procedure. I've resigned 5 days ago and I want to join another company by 15th but current company not letting me go and they want me to work till 23rd. what's the solution?