Byju's — Regarding fraudulent made by byju's

I joined byju's ias one year course and I do not receive proper education from them but they are asking for payment and threatening to pay the amount. I am also having health issues I'm unable to pay the amount when I'm enquiring about the cancellation of the loan they are denying to stop the course while joining they didn't inform about the cancellation of the course. Kindly help regarding this please do the needful for me..