Byju's — Cancelation of subscription

I got their product 1 month back and I didn't ge any calls from any of their mentors. Even I have called for cancelation but they are not at all responding and they are telling that I can't cancel it now because 1 month over. I'm paying 6.8k per month, I can't pay that much and it is not worth also. It's just cheating, they are just running their business. I need to cancel it immediately. I don't have any other options and even they don't have any other option, need to cancel that's it. It is not fair to force the students to pay fees