My Previous employer refused to give my original certificates which he has taken as a security

Hi...Sir/Mam, Myself jigar Makwana,I am living in India,I have joined as an software engineer at an private It company named Esprit solution Pvt Ltd,Ahmedabad(INDIA),I have worked there for 10 months,there is no legal contract or bond with that employer,But I have given my Original certificates and 2 cheques of 50,000Rs. as a security amount,Now I have put resignation from that company because of further study,But my employer denied me to give my documents back to me..How to get it back.Can any buddy tell me.What is the procedure according to INDIA LAW...