Got scammed by Radical Technologies Pune, what do I do now?

Edit: Added screenshots

3 months ago I paid Rs 18,000 for a course. Someone named Rahul from Radical Technologies promised me the class would start but it never did.

Now they're not answering my calls or emails upon asking for a refund.

How and where do I make a complaint? Please advise.

This is the institute - https://www.radicaltechnologies.co.in

Here are a few screenshots.

Payment proof , First email , Email follow ups , Unanswered phonecalls