MY LANDLORD IS NOT GIVING SECURITY AMOUNT BBACK

MY NAME IS RAHUL SHARMA.I TOOK A ROOM ON RENT FOR RS.11,000/- IN RAJENDRA NAGAR BECAUSE NOW A DAYS I AM PREPARING FOR IAS.I GAVE SECURITY OF RS. 11,000 AND ONE MONTH ADVANCE RENT I.E RS.11,000 TO MY LANDLORD NAMED HORAM SINGH RESIDENT OF 7/53, OLD RAJINDER NAGAR,DELHI.I STARDED LIVING FROM 8/7/16 AND LEFT THE ROOM ON 17/7/16. THE MAIN THING IS THAT HE DENIED TO GIVE MY SECURITY OF RS.11,000 TO ME. SO YOU PLEASE HELP ME TO GET MY RS.11,000 BACK.