Byjus — Byjus product cancellation and refund the amount

I was purchased the product 4 months back and my kids are not showing interest to watch that. and sales persons Pallavi and Riyaj told me when ever you want to cancel the product it will be possible to cancel i already sent email to cancel but no responds from them and sales people are not answering my call to contact them. They have cheated me. I send the mail for byjus support team for cancel the product and refunding the amount. 7000 per month emi and product is not using no one is responding. They are cheaters. Please cancel the application/product and refund the amount.
Please help me on this.

Sales people told me cancelation will possible while taking the product.