Lodging complaint for illegal money lending business

Respected experts. There is one person in our locality who is illegally lending money to others in his own name and in the name of his different family members . He is lending money through bank and taking interest through bank. He takes promissory note and cheque and charge around 40 to 50 percent per annum. One of his victim ( Debtor) has supplied his bank statement to me and I could see the entries for principal and interest in it. The online records of our district court also revels that 5-6 cases number of 138 Case filed by each of his family member. Based on the bank statement of one of his debtor and court case, can I file a complaint in SDM office that there is a suspicion that he is carrying on illegal money lending business. I have got an RTI reply that he is not having licence for it. Can I lodge complaint in SDM office who is licence issuing authority and Police authorities. What legal problems can I face in lodging such complaint based on my suspicion What legal action that person can take against me in lieu of my complaint to SDM or other authority. Thanks for the suggestions Riya