Byjus - Not satisfies with byju s

I have purchased the byju's course when byju's concellor call me then he told us that when you want then you can cancel the order if not satisfies but now they are not canceling my order.my father is not much literate and they took my father sign on loan paper and submitted to other company and not told us about that.now I want to stop my EMI payment because I am not satisfies with byju's but byju's is not cancelling.please help us I am from poor family and I want to study in patna but my money is going waste in byjuss