Pms bonus payback in fnf

I'm a banker working in a retail branch banking segment. I was entitled with the performance bonus for the year Apr 22- Mar 23. I further continued working with the elevated title and the credence of bonus payup - (48100) and 18% hike over my salary. Later ahead, I resigned in Oct 23rd (which served my notice tenure until Jan 26th 2024). As per the company conducts, my latest month salary and final settlements had to be received after the suggested period of my LWD. It's 26th of Mar 2024 i receive an email with the FnF settlement wherein i am in lieu of paying ₹ 9899/- overhead of receiving any penny from my final settlements and latest month salary. HR states that the amount which was provided to you as a PMS Bonus in the Yr 22_23 is already settled for the tenure you've served and you're supposed to return the bonus amount to the company as per the guidlines. I'm thrilled to know if there really are any such guidelines where a PREVIOUS YEAR Performance bonus is calculated for the deductions in the next year if resigned? Could gist more of the case. Please get in touch if any of you could help me here a little. TIA!!