House rent

I have rented a house with my family and gave 50k as security deposit to house owner without signing  rental agreement. But due to  some unfortunate reason, i have vacanted the house within two months. Eventually, i have requested the house owner to consider my situatiion . But he refused to give security deposit and asked me to place some other person as tenant for rest of the months (09 month).

What i have do so that i can get back my money ? Pls kindly advice.