Recovery of deposit amount

Dear Sir , Date:29-10-2016 In the year 2016 on the month Feb.. I had hired a shop near my place which belongs to an old family friend of mine, since the whole landlord family knew me. As agreed, I was to pay a deposit of 1 lak an monthly rent, Since he had to pay long pending outstanding property tax He requested me to give the deposit and assured to make the agreement registered later. After starting my business, paying the monthly rent regularly, I requested him of making the agreement but he “landlord” kept on avoiding it, asking him, I will make it online. I have been paying the rent regularly for the past one year, In spite of loss in business,. And more ever my business was relayed on Power “Electricity”. And often due to power failure, I was not able to manage it properly, Hence I requested the landlord that I need to vacate the shop, And to refund the deposit, Now It is more then eight months But he is delaying it ,And for the past four month has past the shop is closed. He is waiting for some one to occupy it and refund the deposit. Please help. Santosh