Institute not refunding my salary deposit what to do

Dear Sir I am employed as a faculty in a private college in Bangalore. At the time of joining, I was informed that, a salary deposit of Rs. 60,000/-will be deducted from my salary in three installments and was also supposed to submit the Original highest degree certificate as a deposit to the college. Recently, I had collected back the certificate in January 2017 and from that onwards, my salary has been withheld by the administration. Irate by the incidents, I had put down my resignation and now, the institution claims that the salary deposit will not be returned as I am leaving the institution before the period of one year and also neither confirming acceptance of resignation nor releasing my salary even 3 working days after sending mail intimating resignation. Please suggest how to proceed further in this regard