My Landlord Not ready to give back Security Deposite -30000

Landlord Has 2BHK and he has given 1 Room on rent to me and another to 2 other girls. He is made 2 Separate rent agreement 1 for my room with me and 2nd for another room with those 2 girls. 1. I had 11 month deed with My landlord , But due to some personal reason I had to leave room after 3.5 months. As per deed and verbal communication I gave 1 month notice to my landlord (Verbal as well as written). In this 1 month i am not staying in that room but ready to give rent as it is month notice period. Note : There was no lock-in period on the agreement, And also mentioned in Agreement that if i want to leave i can after giving one month notice 2. At the time of agreement i asked if we can have 1 agreement for whole house (all 3 girls) , as it will be easy for setup cost and when i leave i can bring replacement girl and get my setup cost back. He clearly mentioned that we are not allowed to bring replacement at all and only they have authority to bring girl in that room. 3. I am married but was having some problems with my husband so decided to stay seperatly , I moved into there house on 15 August , and informed them about my situation on 21 August (within 1 week) we had rent agreement deed on 28 august. I informed them before making agreement. They had no issue at that time. Owner rections - 1. Now when i informed the owner that i will be leaving, He is talking very badly with me. Shouting and saying I wont give you your refund unless you bring your replacement. (He only said before he does not want any replacement and only he can bring replacement) . 2. After i informed i am leaving, he came in my room in my absence and opened almira and cabinates to check if i still have my stuff there. (I had all my stuff present till that time) 3. They are talking all kind of bad thing about me to my roomates , they are saying i am lier and i lied about my status when i moved to house and told them after 1 month. They are saying now as she has left her husband , she migth be with some other boy. And saying all kind of things about me (as i am a charaterless girl) 4.They are now asking the 2 girls from another room also to vacate the flat and blaming me that they will be homeless coz of you. 5. They call me start shouting , that we had pity on you that y gave you flat and now you are doing this. 6.When i went to talk to them face to face , owner is shouting on me on everything (thing that are not even present or matter like why you call me at 10.30 at nigth to inform this you are charater less girl thats why you called so late .When i call him my 1st line was is it ok if i talk now and i work till 11 at nigth which he is aware of ) 7.He is shouting and saying send me legal notice then only i will reply now seeing me as a single alone girl. (Note : As he deny my security deposite , i did not pay him rent of notice period month )