Byju's — Cancellation of my subscription

My name is Anitha.
The byjus councellor came and forced to take the subscription of LKG-3
Of Rs.75000.
I have already paid Rs.24000 and told that any time you can cancel the subscription
But now we don't want the product . As they promised we didn't get mentor support too. not done any class now I want to cancel but they are not responding.
I want to cancel the subscription immediately or I will file case on you