It seems notice period is 1 month and you wish to be relieved at notice of 15 days.
Kindly check your appointment letter/service agreement/employee rules/standing orders applicable in your case, and confirm if you have given your concurrence on modalities of notice pay recovery.
You may submit notice of resignation with effective date of resignation clearly written in it , addressed to good offices of your appointing authority, MD, and request the good offices to inform you in writing to whom you should handover the charge, and submit the company property under acknowledgment. You may mention that you are willing to cooperate to train the employee whosoever is designated as your replacement employee, up to and within effective date of resignation, and ask to supply you the acknowledgment of notice of resignation immediately, and acceptance of resignation, FNF statement, payment of dues, work experience/service certificate, relieving certificate, form 16, PF accumulation reports and withdrawal/transfer forms, NDC etc by effective date of resignation.
You may submit details of payables by you to company e.g. advance/imprest cash if any, and payables by company to you e.g. incentives/bonus/leave encashment/salary/expense reimbursement etc and request the good offices to adjust the notice pay for......days @ basic/gross/CTC as agreed by you, in FNF statement. You may request the good offices to verify the statement submitted by you and let you know for variances if any, so that the needful can be done.
All accounts can be compiled in FNF statement.