Byju's — Joined in byju's ias one year course

Sir i want to cancel Byjus class because they are not teaching me forcing me to pay the amount telling that your cibil score will be impacted (and they are threatening that you can't get any new job or any loan for in future) I'm unable to pay the money too and byjus policy for cancellation in 15 days they didn't mention me about the cancellation process I contacted them multiple times but now there is not positive response so kindly help me I want refund my amount. Thanks.