A hostel in greator noida not giving my sister's security fees.

Hi guys, as the title says," My sister is doing her graduation from G.noida, so i got her admission in 'Nalanda girls hostel'. We paid all the fees and they took security deposit of 10k above that, now after a year she has left that hostel, the guy who runs it is not picking up calls, and when he picks it up he makes useless tantrums like i am not in town and then hangs up the phone and then he doesn't answer calls and its been more than 4 months now. I was busy with my work, so was not here and now that i have returned back, i am planning to visit there in their hostel office, Now i want to ask if he refuses or doesn't appear in the office, what further legal actions can we take to get the money back?