Wrongful deduction from Security Deposit by landlord how to proceed

Hi, I had an 11 month agreement @ 14K per month rent. I shifted on 7th April but landlord request to pay from 1st of month and said later when we shift he will adjust. I got shifted to Mumbai and my family was still living in that house. After 11 months I requested landlord not to increase the rent and told him that I will shift my family in 2-3 months time. He verbally agreed and kept paying 14K as rent. When I left the house electricity bill was not generated and he held back deposit money citing he will pay when bill is generated. I shared the previous bill reading and asked him to deduct the amount and pay back the balance. He kept on giving excuses and finally he said that he is dededucting 4 months increase rent (1400 pm), electricity bill and overstay of 3 days (where he already have 7 days rent of first month with him). The clause clearly says that post 11 month contract can be extended @ 10% increase in rent, in case of extension a fresh agreement to be signed by both parties