Byju's — Regarding cancellation and refund

I have purchased byjus before three months and I received a tablet without the ias app or video content so I have sent a cancellation request through email and by calling so they told me that they have initiated the cancellation but after three month they have told me that they cannot cancel it after three month but I raised the cancellation request within 10 days of receiving the product so I want complete cancellation and refund.