You can file a complaint with the NBFC Ombudsman by writing on a plain paper and sending it to the concerned office of the NBFC Ombudsman by post/fax/hand delivery. One can also file it by email to the NBFC Ombudsman.
2)The Reserve Bank of India (RBI) has introduced a complaint management system (CMS) on its website. Through this portal you can file complaints against all financial service providers such as banksand non-banking financial companies (NBFCs), which are regulated by the central bank.
3)To file a complaint, you need to visit https://cms.rbi.org.in. After that, click on file a complaint link.
4) legal fees vary depending upon lawyer engaged by you