Byju's — byju's is not cancelling my order & not refunding my money - [protected]

I have placed my order (Id - [protected]) on 29th july and i have raised the cancellation request on 04th aug. But they are not cancelling my order and forcing me to pay the emi which will start from 7/9/20 since i have signed nach mandate it will deduct from my account on given date.

I have not received any product yet and now the product is no longer need so i wanted to cancel it but they are not processing my request. Please help me in cancellation of my order & loan as well.

At the time of purchase their sells person told me that you can cancel your order within 15 days after you received. But i have not received any product still they are not cancelling my order. Its so frustrating.