Dilip want Register for service to hire a lawyer

A person through his firm took Rs 7 lac from me. This amount was transferred to his firm by RTGS in July 2016. He made agreement on stamp paper. The agreement was for one year. As per agreement he promised to give Rs 4.5 % per month I. e Rs 31500 every month as intrest till one year and return the principal amount of Rs 7 lac on 24th July 2017. He paid me intrest for couple of months in cash. After that he neither paid any intrest nor he has returned the principal amount.