Security Deposit on Rented Flat Refund Case

Hello, I am single women living in a flat in South Delhi with a rent agreement valid for 11 month expired on February, 2021. Due to lockdown and pandemic, I had move to my hometown in June 2020 but didn't vacated and paid full rent during the same period. In March 2021, I arrived there again and paid my rent for March and April in advance with all dues of electricity and all. Again due to sudden announcement of lockdown in New Delhi, I decided to vacate and told my owner that I am vacating the house on 16th April and left Delhi on 19th April. However, I have paid till 30th April, 2021. I have paid security for one month and sold my new A.C to him, but he didn't paid anything for that. After 2 month he paid only 25 % of my A.C amount with a promise that after his house rent out again then he will pay. Still, my 75% of A.C price and 1 month security plus advance rent is due. Now, he is staying send me original bill of A.C and take cash and for security I will not pay anything. Although, the rent agreement is over and asking me 2 month of notice period. I am really distressed. What are my legal options here now? Regards Prativa