Security deposit Not Returned

Location/place: Noida

Name of company/service: d-fi

I did an Audio Engineering Course from SAE ( http://www.accessatlantech.com/)Chennai in 2009, for which i payed a refundable security deposit of RS 25,000/. The same has not been returned to me after numerous reminders. It has now been 2 years and i am still requesting to get my security deposit back.The institute is not picking up my calls and is making all efforts to not acknowledge my complaint.
I have sent them all the documentation and information they had requested almost a year back.
Please help me out as i really need my money back.