Byjus — Fraud by byjus company

Have taken online batch for IAS preparation but Books are not delivered yet. I have taken the classes in August of 85000 nd 35000 is paid through EMI but they haven't sent the books even they are not addressing my problem. They kept on saying after 72 hours you will receive a call but they are not calling back.
I have called the customer service numerous times bt unfortunately they are not addressing my problem.
So as of now I want to cancel my subscription but they are not cancelling it even they are not delivering the books.
I have suffered for last 5 months waiting for books to study as I have to give exam in 2024 for which I have taken the batch. But the company has made a fool of me also taken money and not providing study material.