Tech Mahindra Limited - Salary not paid for 15 days

I worked on Tech Mahindra Ltd from July **** to December ****. When company paid the salary, our tl approve attandance from **th of a month to **th of the next month but payslip mentioned *st to ** or **st of the month. In this case my last working day of the company its **st December ****, company provides me the salary of December month that based on our **th nov to **th dec attandance which approved by our tl. When i asked to tl about my last **days salary which i worked **th dec to **st dec **** he told me contact with hr, and the hr also says your fnf must correct. But when company paid salary based about **th to **th attandance in every months then how my fnf is correct and not paid my last ** working days salary?