How to recover salary deducted unfairly by company

I WORKED MUM BASED SECURITIES (SHARE MARKET) IN CHENNAI. I WORKED 20 DAYS AGAINST THE NOTICE PERIOD OF 30 DAYS. MY RESIGNATION DATE WAS POSTPONED BECAUSE OF MY REPORTING MANAGERS POSTPONEMENT. HR ALSO DID NOT SAY ABOUT THE DEDUCTION IN MY TELEPHONIC CONVERSATION. MY TEN DAYS SALARY WAS DETUCTED. HR TOLD THAT AS PER HR POLICY THE SALARY WILL BE DEDUCTED IF A EMPLOYEE DOES NOT WORK AS PER THE NOTICE PERIOD. BUT IN MY CASE, MY RESIGNATION DATE WAS POSTPONED DUE TO THE POSTPONEMENT OF MEETING WITH MY STATE HEAD. THEY DONT GIVE ANY ANSWERS FOR THAT. KINDLY GIVE ME THE SOLUTION. THE VALUE OF 10 DAYS SALARY IS AROUND 4500.