Byju's — Cancellation or refund of byjus course

We taken course 10th 11th 12th price of 5 thousand through cheque and 68 thousand through EMI he said that if you don't like you can return byjus within 15 days and we
dont like and don't want this so cancel it 12th day we informed them we are calling he/she we will take you
cancellation process after taking to your son when I give phone to my son from there end they disconnecting and the same thing they are repating thing I am reaching through call they are disconnecting the call then I informed them through email they are just saying our senior executive call from which day we informed they are calling saying we take you to cancellation process they disconneting when we try to call on there cancellation number they are not cancelling it they are just repeating same thing