Byju's — Cancellation of courses/ premium subscription. Stop EMI payment.

My parents paid for 1 year Byju's premium subscription. The total loan amount is Rs 50000 and I paid Rs 5000 for the down payment. But since I am unsatisfied with the classes and the lessons learned in the classes do not match with my school lessons, I want to cancel my premium subscriptions. The books I received are kind of hard to understand too. I have been wanting to cancel for the past months, but they told me to finish the two months trial first. After the trial ended, I tried contacting them but they do not answer my calls or messages. Even after my complaint, no proper calls or verification were given. My first payment is on 7.07.2022 and I want to stop my subscription before that. I don't expect refund but please stop my Emi payment. Please kindly look to it.