Tech Mahindra — FFS not received

Hi I worked for tech Mahindra and My last working day was 2nov, following my resignation I was told I will get FFS but 15 days later i was told that I was absent from Oct 19 2021 to 1st Nov 2021 and Instead of TECHM paying me, I had to pay them amount of approximately 4500₹.
No one from there team or Dept is helping