Byju's — byju's cancellation and refund

I came in contact with the byju's through their apartment campaign, two months back. I asked them for a cancellation around 10 days after talking to that guy they gave me a call and told me to use it once i agreed and also asked the person to start cancellation process (Around 26 feb.) and thought the matter is closed. They did not cancel the registration.
I sent the email to byjus support team many reminders for cancellation & refunding the amount, and taking the tab back. They did not cancel even after sending many reminders. One of the person mr rahul dixit told me that cancellation is not possible because already two months is over. I don't want the product. They are cheater. Please cancel and refund the amount.