Cyber Security

I uploaded an ad for my furniture on a marketing site. They called me from their side and were asking for my banking details and more secret information related to my bank. When I started questioning him back, he started abusing. Clearly, he was not an employee of that organisation but a scammer who was trying to transfer money fraudulently. I have the call recordings. I saved myself but there are lots of people who can be targeted by these frauds. It's one of India's big companies. It can be a big scam which should be exposed soon. what should I do?